After the last refresh of my panel certificate I got this message in i-mscp debug:
LetsEncrypt (panel.xxxxx.de) Status von diesem Posten für einen neuen Versuch ändern Incomplete authorizations
for several domains.
In Domain/Letsencrypt I see the same!
It looks like a warning, not an error 
might it be because of that new feature *cert which requires dns type:
Shell-Script: letsencrypt.log (excerpt)
- "challenges": [
- {
- "type": "http-01",
- "status": "valid",
- "uri": "https://acme-v01.api.letsencrypt.org/acme/challenge/J8CwVYa_GzTBvTgVJQEJ6uAji2aTHBBpE6UPE7jF1SU/4004448353",
- "token": "J2JAHcMJ01Zm6tgSh627zFPZLx3jEzVLxQQjMz8y3sA",
- "keyAuthorization": "J2JAHcMJ01Zm6tgSh627zFPZLx3jEzVLxQQjMz8y3sA.G1NCyqqAjkPpUMo19nnsoT0mfMU_dqhoGibSjSEWHo4",
- "validationRecord": [
- {
- "url": "http://xyxyxyxyxyxyxyxy.de/.well-known/acme-challenge/J2JAHcMJ01Zm6tgSh627zFPZLx3jEzVLxQQjMz8y3sA",
- "hostname": "xyxyxyxyxyxyxyxy.de",
- "port": "80",
- "addressesResolved": [
- "1.2.3.4"
- ],
- "addressUsed": "1.2.3.4"
- }
- ]
- },
- {
- "type": "dns-01",
- "status": "pending",
- "uri": "https://acme-v01.api.letsencrypt.org/acme/challenge/J8CwVYa_GzTBvTgVJQEJ6uAji2aTHBBpE6UPE7jF1SU/4004448354",
- "token": "txtheSbq3VczPclsJScabr3hLF3XBKW7ONkGwRJCaSE"
- }
- ],
The main problem is: the buttons revoke or settings are missing then! 
