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.