Additional chat-related features and issues within Microsoft Teams for business
Hi KJP37, I'm Sergio, it's a pleasure to help you.
You can reset the Teams app to the default setting, but your groups and teams will don't go.
To reset the Teams app to default setting:
a. Fully exit the Microsoft Teams desktop client.
b. Go to File Explorer, and (Windows 10) type in appdata\Microsoft\teams and remove all the content. In Windows 11 you type AppData\Local\Packages\MicrosoftTeams_8wekyb3d8bbwe\LocalCache and remove all the content.
c. You must restart the app and try again.
However, you can enable guest and external access to solve the situation.
to setup the guest access in the Teams admin center
a. Sign in to the Microsoft Teams admin center.
b. Select Users > Guest access.
c. Set Allow guest access in Teams to On.
d. Under Calling, Meeting, and Messaging, select On or Off for each capability, depending on what you want to allow for guests.
Source:
https://docs.microsoft.com/en-us/microsoftteams...
You keep in mind that if you just want to find, call, chat, and set up meetings with people in other organizations, use external access, see:
https://docs.microsoft.com/en-us/microsoftteams...
I hope that the information gives to you will be useful to your purpouses, please let me know about the result, because other users with the same problem will know what to do.
Greetings.