Hello Kara Banks,
Good morning!
Thank you for publishing in Microsoft Community. We are happy to help you.
I'm sorry to hear that you're experiencing this issue with Teams. The error "There was a problem reaching this app" Can be related to the admin or IT policy so first ensure that the app is unblocked in the admin center.
- Access the Teams Admin Center: Go to the Teams Admin Center by navigating to the Microsoft 365 admin center and selecting "Teams" from the left-hand menu.
- Manage Apps: In the Teams Admin Center, go to "Teams apps" and then select "Manage apps."
- Search for the App: Use the search bar to find the app you can't open or app tab you can't open, select the app by hitting the check bar. then click on allow You should check the information by going in permission policies click on the organization policy and check if the app is block or not
However, after admin has check the above setting and you are still facing the issue try to check if you are facing the issue in teams online version. If not clear your teams app cache Reference: Clear Teams cache - Microsoft Teams | Microsoft Learn.
-Check if there is any update on the teams app or you can sign out and sign in again and check the issue
-Reinstall Teams: If none of the above steps work, try uninstalling and reinstalling the Teams app. This can help resolve any corrupted files or settings that might be causing the issue.
Note: Please note that we are not in the same time zone my reply may delay.
We look forward to your reply. This requested information will help us narrow down the scenario and find the right troubleshooting. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation.
Sincerely
Eben Ezer Tres | Microsoft Community Moderator