My students were trying to activate their class accounts this morning and received error messages. Is the site having problems?

My browser / operating system: Windows NT 10.0, Chrome 87.0.4280.88, No Flash version detected

I am also having difficulty adding students to my class since last week. What's going on?

Another Forum topic duplicates this discussion, please see: https://scratch.mit.edu/discuss/topic/474015/
Please add your comments there so we aggregate the reporting to Scratch team for attention.
I have the same issue attempting to add new students to my two classes (initially created in the fall.)