DNSPerf on distant seems to be inline with ping time, so typically USA is about 200-300msec.
https://www.dnsperf.com/dns-speed-benchmark?id=c716e6hlt0yhmuu
I am monitoring the dns error log which on plesk is /var/log/messages showing no errors on those domains we are trying to renew.
The LE requests are logged on /var/log/plesk/panel.log, these shows the same error as letsdebug.
Here is a recent one:
https://acme-v02.api.letsencrypt.org/acme/authz-v3/319170246337
I am completely dumbfounded here looking to find the cause.
It was working fine for many years, only to stop in late January 2024 for all of the domains. I am not sure if Plesk or LE changes something which I do not know that I should comply to.