Looks like Citrix turned off all non-LAS licenses last night. Here's one of my license servers.

Yep we are seeing it too. All licenses fully used with 0 available on a license server registered with LAS. We have a client with a 715 environment affected, modern LAS enabled 2203 environment is fine.

Yeah, i have a REALLY old environment not affected... They clearly built the kill-switch into one of the later releases of the license server.

Ctrl+A -> Del