If you are using the web version of Microsoft Teams and you encounter a caa90019 error, it could be due to the outdated cached credentials (usernames & passwords) in the and accounts.

According to Demandsage.com, there are 320 million Microsoft Teams users in the world. It also said that more than 1 million organizations use the application, including 91 percent of Fortune 100 ...

To fix Microsoft Teams Error CAA30190, check the internet connection, log out and back in, clear Teams cache/credentials, modify the Settings.json file, and reinstall ...