per user time zone settings AVD Windows 11 multi-session

Hi, trying to achieve something we thought and would expect to be quite simple, but it doesn't seem to be!

We have an AVD environment running Windows 11 multi-session and FSLogix. All apps are fine, everything works fine other than changing time zone.

When a user changes their time zone (via Windows > Time & Language) the setting does not persist once the user logs out and logs back in. When a user logs back in the time zone doesn't keep the time zone that the user changed to previously.

Does anyone know why?

We have the 'Allow time zone redirection' group policy setting set to 'Not Configured' and have also tried Enabled\Disabled.

Any help would be appreciated thanks.