[Bug]: Calendar dav sync iCal with Google stopped to work after the NextCloud and Calendar update

[PeopleInside]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After the recent august Nextcloud and Calendar update my Google Calendar sync with iCal has stopped to work.
Now is also impossible re-add it and see it working.
I tested also in a new installation.
I discussed this here (without a staff reply and I'm pretty sure the recent update caused issue) https://help.nextcloud.com/t/calendar-dav-sync-with-google-stopped-to-work
For another issue some staff of the forum suggested to report the issue on GitHub so I'm doing also for this issue

Steps to reproduce

1. Open Calendar (version 4.7.16 Nextcloud version [Hub 8] (29.0.5))
2. Add a new calendar and insert the iCal Google url
3. An error message say is not possible add the calendar
   Server error log:

Error 403 MKCOL
remote.php/dav/calendars/username/calendargooglecom-1 HTTP/1.0

Expected behavior

Calendar should work and be synch with Google.

Installation method

Community Web installer on a VPS or web space

Nextcloud Server version

29

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 28 to 29)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

I use Firefox 129
I discussed this issue here: https://help.nextcloud.com/t/calendar-dav-sync-with-google-stopped-to-work

[PeopleInside]

Issue still present with
[Nextcloud Hub 8] (29.0.6)

[PeopleInside]

This has helped me to resolve the issue for me: nextcloud/calendar#6323 (comment)
I don't know if keep this issue open as I never had issue with nextcloud 28, the issue is burn after nextcloud and / or calendar upgrade.

[joshtrichards]

Duplicate of nextcloud/calendar#6323