Archive mailbox not created when enabling archiving on a user (3.2.1016.0, Exchange 2019)

Hello,

we are trying to enable archive mailboxes for individual users through CloudPanel, but the
change never reaches Exchange. No error is shown in the panel.

Environment
– CloudPanel 3.2.1016.0 (250 licensed users)
– Exchange Server 2019 CU15, single server, one mailbox database (DB01), Enterprise Edition
– Connection Type: Kerberos Authentication
– Exchange Version setting: 2019
– “Allow Archive Mailboxes” is enabled and saved in Setup [please confirm]

What we did
1. Plans > Exchange > Archiving Plans: [created a plan “Archiv 5 GB” with 5120 MB /
we are not able to create an archiving plan – describe what happens: error, nothing saved, …]
2. Opened the user (Company > Exchange > Mailboxes > user). The single-user edit page does not
show any archiving section.
3. The archiving section is only available in the multi-edit view. There we selected only this
one user, checked “Archive mailbox”, entered an archive name, selected the archiving plan
and ticked “Update” for these three fields, then saved.

Result
– No error message in CloudPanel.
– In Exchange the mailbox still shows ArchiveState = None and the default ArchiveQuota
(100 GB), i.e. no archive was created and no quota from the plan was applied.
– Search-AdminAuditLog on the Exchange server shows no Enable-Mailbox (or Set-Mailbox) call
from CloudPanel for this mailbox at the time of saving.

Questions
1. What is the correct way to enable an archive mailbox for a single user in 3.2.1016.0?
Should the archiving section appear on the single-user edit page?
2. Are there prerequisites we may be missing (archiving plan assigned to the company,
database list under “Databases”, CloudPanel service, a specific Exchange RBAC role
for the service account)?
3. Where can we find the CloudPanel log that shows why the change was not written to Exchange?
4. Is this a known issue in 3.2.1016.0 that is fixed in 3.2.1024?

Thank you!