I have always had to renew my box cert manually, but has always worked.
Today I get this response:
Provision a certificate
Something unexpected went wrong: urn:acme:error:serverInternal :: The server experienced an internal error :: ACMEv1 Brownout in Progress. ACMEv1 will fully turn off on June 1, 2021. Check https://letsencrypt.status.io/ for more details.
Following the link it says the service is temporarily suspended according to a plan that will see support ended in June.
There is no mention of ACMEv1 or ACME v2 anywhere on this discourse system.
So the problem seems general and urgent.