Hello @jwilbois
It seems strange. Is it possible to run a few tests? First of all, please check out your LDAP settings. Here’s a screenshot for reference:
The point is that usually line 1 is empty. So, user creation scenario uses not uid of Nexcloud, but uuid by LDAP. Try to set up uid as it perists on the screenshot. This step will work for new accounts only, for old ones, use button 2 on the screenshot.
Also probably these titles will be useful:
Accessing Nextcloud files using WebDAV — Nextcloud latest User Manual latest documentation - official Nextcloud documentation
"LDAP user and group backend" and access via WebDAV - ℹ️ Support - Nextcloud community - ldap issue with similar scenario.
Please let us know if it solved the situation.