No user picture from Active Directory - Nextcloud 23

I used to have a Nextcloud 22 on a Synology NAS, connected to Active Directory.
The user photos were displayed correctly.
For some performance reasons, I decided to install a fresh NextCloud on an fresh Ubuntu 20.04VM.
I successfully connected the NextCloud to the Active Directory, with the same parameters, but no users photos are displayed.
I do not see any error about that in the logs.
Can you please help ?