Cannot add specific user to a calendar event

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Nextcloud version (eg, 20.0.5): 27.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.52
PHP version (eg, 7.4): 8.1

The issue you are facing:
At least one user I have cannot be invited to any calendar event on the Nextcloud.

Is this the first time you’ve seen this error? (Y/N): Y, but I’ve never tested this particular user before.

Steps to replicate it:

  1. Create an event on the calendar
  2. Go to add this one user (all other tested are fine).
  3. The sidebar window just shows a spinning icon and never resolves.

I am also now getting this specific issue

Recently, I am unable to create events in my calendar that have another user onto same Nextcloud instance in the attendees.

It does work if the attendee is not a user in Nextcloud and I can create events for myself

It also works if the other user creates an event in their calendar and invites me

It’s very specific to this user. I created a dummy user and swath same issue for this specific user

I am on the latest version of NC

I have checked and set ownership and permissions for /var/www and all subfiles/folders to www-data:www-data

I have set the data directory (which is /mnt/storage and all subfiles/folders to www-data:www-data as well as the permissions to 770

I ran sudo php occ files:scan —all and it found no errors

When I do an event from an external app such as EMClient it says can’t find the attendee user.

I checked Nextcloud.log and audit.log and nothing seemed to jump out, I also tail -f the logs and performed the action of creating an event in my calendar and adding the other user… it hangs with a spinning wheel in the interface but I didn’t see anything written to the logs…

Any help would be welcome.