I cannot sign in to the Teams app on desktop, nor on web.
I cannot sign in, after clicking on the button it displays a message "We couldn't sign you in. Please try again." and when I try again this repeats indefinitely. I have tried this both on Firefox and Edge and it doesn't resolve. Meanwhile, the app can't load at all, after some time it displays a message "We're sorry - we've run into an issue. Try again. If that doesn't work, try signing out and back in." which I have tried with the same result. However, Teams on mobile works just fine without any complications. I have also posted the same question on answers.microsoft.com and an agent advised me to post it here for more help.
Messages Delayed and Multiple Notifications in Teams Web Version
I communicate with teams from two separate organizations on teams, which requires me to be signed in to two different accounts at once. For that reason, I have to use Teams web version for one of them. In that version, I've recently starting getting delayed responses. Then, once I do get the response, I get anywhere from 3 to 10 notifications that I received a message (both from teams, and from google chrome). I guess first of all, is it possible yet to use 2 accounts at the same time in the teams installed on my PC? And if not, any idea how to fix this issue with the web version?