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Microsoft Lists - There was a problem reaching this app
I've created lists in a Team and added them to a tab. I tried to share those lists with another team - adding Direct Access permissions and then adding them as tabs in the other team. That wasn't com...
So the solution was to reinstall Teams. I installed it over the existing one (i.e. without uninstalling it first). After that the Lists tab in Teams was working. The clue was that it was working for everybody else except for me (after it had previously worked).
Had this issue today. Instead of reinstalling Teams, I think the easier way is to clear the Teams Cache - worked for me. To clear the Teams cache, e.g. refer to https://www.canr.msu.edu/news/clearing-the-cache-for-microsoft-teams#:~:text=Enter%20%25appdata%25%5CMicrosoft%5CTeams,Files%20in%20the%20Cache%20folder.