Download of calendar failed. - PKIX path building failed

I had to import the certificate to the java trust store (not from linux) and restart OH.

Now I get another error

2021-05-16 10:46:49.681 [WARN ] [g.icalendar.internal.handler.PullJob] - Download of calendar failed.
2021-05-16 10:46:49.682 [DEBUG] [g.icalendar.internal.handler.PullJob] - ExecutionException message is: No subject alternative names matching IP address 192.168.x.y found

This seems to be similar to

Is there a possibility to deactivate this strict check?