I think you should check for the caldav-URL. Your debug-log shows the same problem like mine, so my solution could help you too
Baïkal group calendars not shown
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When scanning for calendars, my DAVDroid 0.8 from F-Droid does not show group calendars. The server uses Baïkal, although with a custom frontend for creating calendars and such, and because I don’t administrate it, I don’t know the version (maybe it is visible from the logs?)
I had a look at #345, but well-known path detection is not supported by the server.
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I suppose this is the same as #528 but AFAIK Baikal doesn’t even have group calendars. Or are we talking about Baikal 2?
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Please follow up in #439.