the reneal has failed for some time.
For this unifi server i have always used a script called unifi-update.sh which did all the updates for certs and unifi controller.
The script is writted by:
Website | https://GlennR.nl
https://community.ui.com/questions/UniFi-Installation-Scripts-or-UniFi-Easy-Update-Script-or-UniFi-Lets-Encrypt-or-Ubuntu-16-04-18-04-/ccbc7530-dd61-40a7-82ec-22b17f027776
Now the certs are not beeing renewed by this script and i need to figure out why.