Thank you for your quick reply.
@sdetweil I’m not using pm2 at the moment, but I could try to do it and check the logs.
@MMRIZE sorry, my bad. I changed the password for the post, it’s correct in my .env but not working.
I’m not exactly sure about the Synology url
synology.com says I should use
http://192.168.x.x:5000/caldav
and than log in with my username and password
But an older link is (seems there was an update)
http://192.168.x.x:5000/caldav/username/ejialfjl/
If I’m using the last one in the browser, it is downloading an .ics file.
But it’s not working with both urls.
Maybe I should try to reinstall everything?