Hi @kposten,
Since none of your boards can connect, I am wondering if this has to do with recent updates made to the Maker App and the procedure for logging in. The new updates are outlined here and does require the most up-to-date version of Maker App.
The only other issue I have run into with our boards not connecting occurs when we go back and forth from MakeCode to Code.org. It requires us to reinstall the Firmata for Code.org. The instructions on the page are pretty easy to follow.
Hope this helps!
~Michelle