Dav 401s for iOS and 2Do

Nextcloud version (eg, 20.0.5): 22.2.0
Operating system and version (eg, Ubuntu 20.04): Fedora 34
Apache or nginx version (eg, Apache 2.4.25): 2.4.51-1.fc34
PHP version (eg, 7.4): 7.4.24-1.fc34

The issue you are facing:
I see 401s in my Apache access logs for WebDav transactions for “PROPFIND”, “REPORT”, and “OPTIONS” for seemingly all transactions, but especially iOS webdav (dataaccessd/1.0) and 2Do (2Do/3.8). Everything seems to be working as I am unable to discern any data that is corrupted/missing on the NextCloud side, however, I am concerned I am losing data due to the 401s.

Is this simply a case where Nextcloud doesn’t implement those WedDav/CalDav options? Is this a configuration issue?

Is this the first time you’ve seen this error? (Y/N): Y

The output of your Nextcloud log in Admin > Logging:
There are no Nextcloud logs when this occurs.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

Likely not relevant, will provide if requested. 

The output of your Apache/nginx/system log in /var/log/____:

<redacted> - - [09/Nov/2021:17:25:28 -0600] "PROPFIND /remote.php/dav/calendars/<redacted>/ HTTP/1.1" 401 450 "-" "iOS/15.1 (19B74) dataaccessd/1.0"
<redacted> - - [09/Nov/2021:17:25:28 -0600] "OPTIONS /remote.php/dav/principals/users/<redacted>/ HTTP/1.1" 401 450 "-" "iOS/15.1 (19B74) dataaccessd/1.0"
<redacted> - - [09/Nov/2021:17:25:28 -0600] "REPORT /remote.php/dav/principals/users/ HTTP/1.1" 401 450 "-" "iOS/15.1 (19B74) dataaccessd/1.0"