How to Fix CAA50021 Error Code in Microsoft 365 Apps? - 1

The Error CAA50021, Number of Retry Attempts Exceeds Expectations , occurs when attempting to log into Microsoft 365 applications. This error can appear in almost all Microsoft 365 applications and often occurs when a device fails to register in the Azure AD Admin Center during a user sign-in attempt.

This issue mainly arises when one of the services, Mobile Device Management for Microsoft 365 or Microsoft Intune , is not enabled from the Azure AD Admin Center. However, this may not always be the case, as other factors such as corrupted cache files and account problems could also trigger this error. Stay with us until the end to resolve error code CAA50021.

Before making any changes to your PC, ensure you are not connected to any VPN, as this could prevent logging into office applications. Additionally, consider restarting your system before proceeding with the solutions outlined below.

If your device is not properly linked with Azure AD, follow these steps to check and ensure it is properly connected:

  1. Open Settings using the Win + I keys simultaneously.
  2. Navigate to Accounts from the left pane.
  3. Select Access Work or School.
  4. If you are already connected, click Disconnect and then reconnect. If not, click Connect and follow the instructions to link your account with Azure AD.
  5. If the problem persists, disconnect your account from the Access Work or School Settings , delete your device from the Azure AD Admin Center, and try again.

2. Allow Users to Register Their Devices with Azure AD

This step requires admin access. If you are not an admin, contact your admin to proceed. Users can usually register their devices with Azure AD if Mobile Device Management for Microsoft 365 or Microsoft Intune is enabled.

  1. Log in to the Azure AD Admin Center.
  2. Go to Devices > Device settings .
  3. Enable the option for users to register their devices with Azure AD and verify if the issue is resolved.

3. Re-register Your Device

If your device registration has expired, it needs to be re-registered. This action must be performed by an admin. If you are not an admin, please contact your admin.

  1. Press the Win + R keys simultaneously.
  2. Type cmd and press Enter to open the Command Prompt.
  3. Paste the following commands one by one, pressing Enter after each. dsregcmd /leave dsregcmd /status
  4. Close the command prompt.
  5. Open the Start Menu and type Task Scheduler . Press Enter to open it.
  6. Expand Task Scheduler Library > Microsoft > Windows .
  7. Find and select Workplace Join . Then, click Enable , followed by Run .
  8. Restart your computer to see if the error has been resolved.

4. Repair the Office App

Repairing the application files of your Office application can resolve issues caused by corrupted files.

  1. Press the Win key and type Add or Remove Program .
  2. Press Enter to access the Apps & Features Settings .
  3. Locate the Office App , click the three dots, and select Advanced Options .
  4. Scroll to Reset and click Repair .
  5. If the error still occurs, consider resetting the app .

5. Clear the Microsoft Teams Cache

  1. Ensure Microsoft Teams is not running in the background.
  2. Press the Win + R keys and type %appdata%\Microsoft\Teams in the Run Window .
  3. Delete all files within the Microsoft\Teams folder to fix the error.

6. Reinstall the Office App

If the issue persists, consider reinstalling the Office app. This removes corrupted files that might cause the error.

  1. Press the Win + I keys to open Windows Settings .
  2. Go to Apps > Installed Apps .
  3. Find the Office App , click the Three Dots , and select Uninstall > Uninstall .
  4. After uninstallation, reinstall the app and check if the problem is resolved.

If the error continues, it may be necessary to contact Microsoft Office Support for further assistance.

How to Fix “Printer is in an error state” Issue?

The error “ WinRAR Error: Next Volume Is Required ” usually appears when you’re extracting a multi-part RAR archive and WinRAR can’t find (or can’t correctly identify) the next file in the sequence . This often happens when a volume is missing , stored in a different folder , or renamed in a way that breaks the archive’s expected order .

How to Fix CAA50021 Error Code in Microsoft 365 Apps? - 2

In this guide, we’ll go over the most reliable fixes confirmed by affected users, along with what each method is doing behind the scenes so you can choose the right one for your situation.

Important: To extract multi-volume archives, you should always start extraction from the first file in the set. This is usually file.part1.rar , or (in older sets) the main .rar file that comes before .r01 , .r02 , and so on.

1. Download and Place the Missing RAR File

WinRAR needs all parts of a multi-volume archive to complete extraction. This error usually appears when one of the volumes in a set like .part2.rar , .r01 , .r02 , .001 , and similar naming formats is missing . Downloading the missing volume and placing it in the same folder as the other parts allows WinRAR to continue extracting normally .

  1. Look at the error message or review the list of archive parts in the folder.
  2. Identify which volume is missing (for example, part2.rar , .r02 , .001 , etc.).
  3. Go back to the website or source where you downloaded the archive.
  4. Locate and download the exact missing file using the same naming format as the others.
  5. Make sure the new file name matches the pattern of the rest. Example: If you have file.part1.rar and file.part3.rar , the missing one must be file.part2.rar .
  6. Move the downloaded missing volume into the same folder as the other archive parts.
  7. Confirm that all parts are in a single folder before extracting.
  8. Right-click the first file in the series (usually part1 or the main .rar file) and select Extract Here or Extract to Folder .
  9. WinRAR should now detect all volumes and continue extraction normally .

2. Manually Browse & Select the Next Volume

Use this method only if the next volume already exists , but WinRAR is failing to detect it automatically. This can happen due to incorrect naming , the file being in a different location , or a temporary file access issue. Manually browsing helps WinRAR locate the correct volume and resume extraction without interruption .

  1. Right-click the first file in the series (usually .rar or part1.rar ) and select Extract Here or Extract to Folder .
  2. When WinRAR cannot find the next volume, it will show the “ Next Volume Is Required ” message.
  3. A small window will appear, allowing you to manually select the next volume .
  4. Use the file explorer window to locate the folder where the other archive parts are saved.
  5. Select the next part based on the naming order (example: select file.part2.rar after file.part1.rar ).
  6. Make sure the selected file matches the naming format of the archive (no extra characters like (1) and no mismatched numbering).
  7. WinRAR will resume extraction using the selected volume .
  8. If additional volumes are missing or stored separately, WinRAR may prompt you again. Repeat the same process until extraction completes.

3. Rename the RAR files in Order

WinRAR relies on a proper naming sequence (such as file.part1.rar , file.part2.rar , file.part3.rar ) to extract multi-volume archives. If a file is named incorrectly, contains extra characters, or is out of order, WinRAR may fail to locate the next volume and show this error. Renaming the files correctly helps WinRAR follow the sequence and extract the archive without interruptions .

Note: Renaming only changes the file name , not the file contents. The goal is to restore the correct sequence so WinRAR can detect the next volume.

  1. Go to the folder where all the RAR files are saved.
  2. Make sure all parts of the archive are present and stored in the same folder .
  3. Check how the parts are currently named . Common patterns include:
file.part1.rar, file.part2.rar, file.part3.rar
file.rar, file.r01, file.r02, file.r03
  1. Look for files that don’t match the expected numbering pattern (for example, file.part01.rar , file.part1(1).rar , or unrelated names).
  2. Rename each file so it follows the same order without extra characters or mismatched numbering. Example:
Incorrect: file.part1.rar, file.part3.rar, file.part2(1).rar
Correct: file.part1.rar, file.part2.rar, file.part3.rar
  1. Make sure the text before the number is exactly the same for all files.
  2. Only the last part number should change.
  3. Right-click the first file in the series (usually part1.rar or the main .rar file) and select Extract Here .
  4. WinRAR should now recognize the sequence and continue extraction normally .

If you still get the same prompt: the archive set is likely incomplete (a part was never downloaded or was removed), or one of the volumes is corrupt and must be re-downloaded from the original source.