The error code CAA5004B usually crops up when you are trying to log into your Microsoft Teams account.
Why does it occur?
This program is designed for local, remote or distributed work groups.
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The complete issue notification reads:
Something went wrong
We couldnt sign you in.
If this error persists, contact your system administrator and provide the error code CAA5004B.
In this post, we will delve into 5 ways to solve this problem.

Fix 1: Clear Cached Data in Teams
Step 1.
Right-hit theTeamsicon in the system tray and selectQuit.
Input%appdata%\Microsoft\Teamsand hitEnterto open theTeamsfolder from File Explorer.

Delete all the folder in theTeamsfolder.
Restart this program to see if Microsoft Teams error CAA5004B appears again.
Fix 2: Reset Microsoft Teams
Step 1.
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PressWin+Ito openWindows Settingsand selectApps.
InPrograms and features, locateMicrosoft Teamsand click onthree-doticon to selectAdvanced options.
Click onTerminateto endMicrosoft Teamsand hitRepair.

If this doesnt work, hit theResetoption.
Fix 3: Clear Windows Credentials
Step 1.
In the search box in the top right corner, typecredential managerand hitEnter.

SelectWindows Credentialsand scroll down to locateGeneric Credentials.
Next, remove all the credentials related to Microsoft Teams and Office.
Is the Credential Manager not working in Windows 11/10?
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Now try the methods listed in this article to fix this issue.
Fix 4: Reconnect Your Teams Account
Step 1.
OpenWindows Settingsand head toAccounts.
InAccess work or school section, disconnect your Teams account and confirm this action.
Once done, reconnect the account to check for any improvements.
Fix 5: Disable VPN Connection
Step 1.
OpenWindows Settingsand go toNetwork & Internet.
In theVPNsection, opt for VPN you are currently using and tap onRemove.
To prevent its interference, you’re free to opt toallow Microsoft Teams through Windows Defender Firewall.
Heres how to do it:
Step 2.
Go toSystem and Security>Windows Defender Firewall>Allow an app or feature through Windows Defender Firewall.
Click onChange settingsand locateMicrosoft Teamsfrom the list.
Check the boxes besidePrivateandPublic.
Tap onOKto save the changes.
To avoid this, reinstalling Microsoft Teams from scratch can help you out.
Right-tap on theStartmenu and selectRun.
Typeappwiz.cpland click onOKto launchPrograms and Features.
Right-click onMicrosoft Teamsand selectUninstall.
After the uninstallation is finalized, download and reinstallMicrosoft Teamsfrom its official website.
Sincerely hope that it’s possible for you to benefit from it!