Teams is blocked on this screen every time I open the desktop client. I tried to uninstall, re download, and also erase all cache elements in the library. I use Mac OSX with El Capitan. However, I am able to open and use Teams correctly in my mobile app.
The strange thing is that, when I erased all the cache and re-downloaded, it opened correctly, while after closing and opening a second time, the problem appears same as before.