There was also this announcement that Let's Encrypt is blocking Plesk as an emergency measure; I haven't seen any followup saying that they re-enabled it but I may have just missed it.
Might not be related to your issue, though.
There was also this announcement that Let's Encrypt is blocking Plesk as an emergency measure; I haven't seen any followup saying that they re-enabled it but I may have just missed it.
Might not be related to your issue, though.