In TEAMS, when I click on the assignment link under the Team name, I get an error message that says "There was a problem reaching this app." How do I fix this?

Hi @Brenda Edins,

Thank you for posting your question in the Microsoft Q&A forum.

I understand you’re encountering the error “There was a problem reaching this app.” when clicking on the assignment link in Teams, even after reinstalling the app. Since this happens on both the desktop and web versions, it’s likely not just a local installation issue. Here are some troubleshooting steps you can try:

1/ Test with a Different Account or Device

• Sign in with another Teams account on your device.
• Sign in with your account on a different device or network. This helps determine if the issue is account-specific or related to your device/network.

2/ Check Network and Connectivity

This is important even if other web services work, as Teams has specific network requirements.

• Bypass VPN/Proxy (Temporarily): If you are using a VPN or proxy, try disconnecting from it (or configuring Teams to bypass it) and test Teams. Many "reaching this app" errors are related to proxy/VPN settings.
• Test on a Different Network: If possible, try connecting your computer to a completely different network (e.g., a mobile hotspot) and test Teams. This helps rule out your primary network's firewall, router, or ISP.
• Check Microsoft 365/Teams URLs and IP Ranges: Ensure no firewall or network device is blocking the necessary URLs and IP ranges for Teams. Your IT administrator should consult Microsoft's official documentation for this: Office 365 URLs and IP address ranges - Microsoft 365 Enterprise | Microsoft Learn.

3/ Review Browser Settings (For Web Version Specifics)

Even though it affects the desktop app, the web version experiencing it might offer clues.

• Disable Browser Extensions: Temporarily disable all browser extensions (especially ad-blockers, privacy extensions, or security tools) for the browser you use for Teams web.
• Browser Hardware Acceleration: In your browser settings, try toggling hardware acceleration off/on and see if it makes a difference.
• Review Browser Settings (For Web Version Specifics)
• Even though it affects the desktop app, the web version experiencing it might offer clues.

4/ Examine Teams Debug Logs (Advanced Diagnostic)

Teams has built-in diagnostic logging that can provide more specific error messages.

For Windows 

• Navigate to bottom right corner of the screen, right click on Teams icon and select Collect Support Files

• Go to Downloads folder, you will see 2 folders as below. Please allow few minutes for the files to appear here.
• You can upload the 2 folders to the ticket for the technical engineer to investigate the issue. If the size are too big, kindly zip/compress them before uploading.

Review the logs (especially MSTeams Diagnostics.txt or logs.txt) for more detailed errors related to the initial app loading or connection. These logs are often best interpreted by Microsoft Support.

5/ Contact Microsoft Support 

If none of the above steps resolve the issue, especially if it follows your account or persists after extensive network checks, it's time to engage Microsoft Support.

Log in to the admin center, navigate to Show all > Support > New service request. Clearly describe the issue, including all the details you've shared with me here and any troubleshooting steps you've already taken. They have the necessary tools and elevated access to your Teams logs to thoroughly analyze the issue and pinpoint any underlying service issues or complex configurations causing this behavior. 

Note: Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution. 

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this. 

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out. 

I'm looking forward for your reply. 

As other users will also be looking for information in this community, please click on "Accept Answer" and feel free to vote for this answer. Your valuable vote will definitely help other users with similar questions to find the right channel and useful information more easily. 

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Hi @Brenda Edins,

Thank you for your response. I’m glad the initial issue with accessing assignments has been resolved. Regarding to your new concern, where assignments show as assigned to no team members even though you selected all members, this usually points to a sync or permissions issue between Teams and the Assignments app. Here are some steps you can try:

1/ Verify Team membership Sync

• Go to Teams > Right click on your Teams and choose Manage Team > Members and confirm that all intended users are listed as members (not guests).

• If you recently added members, allow some time for the sync to complete. Sometimes it can take up to an hour.

2/ Clear Teams cache and reset app

Cached data can interfere with assignment syncing. Follow the steps based on your Teams version:

Classic Teams

1. Quit Teams:
   • Right-click the Teams icon on the taskbar and select Quit.
   1. Open the Run dialog:
      • Press Windows logo key + R.
2. Enter this path and click OK: %appdata%\Microsoft\Teams
3. Delete all files and folders in that directory.
4. Restart Teams.

New Teams

Option 1: reset the app

1. Open Settings (type “settings” in the search box).
2. Go to Apps > Installed apps, search for Microsoft Teams.
3. Locate New Microsoft Teams, click More options (...) > Advanced options.
4. Under Reset, select Reset.
5. Restart Teams.

Option 2: Delete cache files

1. Quit Teams:
   • Right-click the Teams icon on the taskbar and select Quit.
2. Open the Run dialog:
   • Press Windows logo key + R.
3. Enter this path and click OK: %userprofile%\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams
4. Delete all files and folders in that directory.
5. Restart Teams.

For reference: Clear the Teams client cache

3/ Recheck assignment settings

• After clearing cache, open the assignment and confirm the Assigned to field.
• If it still shows “No students,” click Edit, select the team or individual students again, and save.

4/ Test with a new assignment

• Create a new test assignment and assign it to all members to confirm if the issue persists.

If you tried these above steps but the issue still persists, I highly recommend you ask your IT department to create a support ticket through Microsoft 365 admin center. This will allow our technical team to investigate the issue further.

This will help escalate the case to the appropriate backend team and expedite the troubleshooting process. Connecting with Microsoft Support gives you access to live assistance from experienced agents who can escalate your case to specialized teams when needed. They also have the tools and capabilities to perform deeper backend analysis and provide tailored solutions that go beyond what’s available through community support.  

To create a Support ticket, your admin can go to Microsoft 365 admin center (use the admin credential)   

Please follow this article: Get support - Microsoft 365 admin | Microsoft Learn.

Note: Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution. 

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this. 

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out. 

I'm looking forward for your reply. 

As other users will also be looking for information in this community, please click on "Accept Answer" and feel free to vote for this answer. Your valuable vote will definitely help other users with similar questions to find the right channel and useful information more easily. 

Thank you for your kind words. 

Note: Please follow the steps in our documentation to enable email notifications if you want to receive notifications related to this thread.