I have been making an attempt to keep my Google account (Contacts and Calendar) in sync with my NextCloud instance and not have duplicates, have them act more as one. I’ve already found ways to import and export between the two but if there is ever a change on one or the other I’d have to go through the process again. Everything I keep reading says DAVx5 will be the solution to this but all I come across is basically showing how to keep your NextCloud stuff automatically synced To your Google account, not two-way.
I setup everything DAVx5 needs on my OnePlus 6T, installing Tasks and giving it permissions, preventing battery optimization, etc. It has been able to connect to my NextCloud instance fine, I was even able to make a test calendar and it appeared in my Google Calendar. But for some reason none of my Google information (Calendar or Contacts) show up in DAVx5. I checked the app permissions multiple times and it has access to everything.
I checked the logs but did not find any issue, it appears to connect to my NextCloud instance just fine.