Microsoft Teams desktop error code caa70007 can occur if the application is stuck or fails in the login process. Here's the working fix.

If you receive A JavaScript error occurred in the main process, Uncaught Exception message when you try to open apps like Skype, Discord, etc, in Windows 11/10, then ...

Microsoft is resolving a known issue that causes "couldn't connect" errors when launching the Microsoft Teams desktop and web applications.