Does an in-place archive actually exist or not?

Question

Active Directory

Hello!

I got tired of googling, so I decided to turn to real people.)

Problem (it's the same question):
Some mailboxes do not move to a new database (within the forest).

What we have:
Archive boxes are connected (if you look at the shell, that is ArchiveGUID, and in ECP "Mailbox type" - "User (archive)", well, in the same ECP, if you look, then archiving is enabled). However, in the shell, the ArchiveDatabase field is empty, and in ECP, the Archive Database field is empty, even though the Archive Status field is "local". In the ECP migration details, here is the following error:
MigrationPermanentException: Recipient ‎'cb90bc8c-2324-4868-a899-93428234f90d‎' is not a mailbox.
Here is the GUID from the error, this is the GUID of the archive base.
When migrating only the primary mailbox, the error is slightly different, but the meaning is the same:
MigrationPermanentException: The archive database for the mailbox is not explicitly set. Therefore, the main move for this user cannot be allowed.

What I have done so far:
I practiced on one mailbox and through Set-Mailbox set ArchiveDatabase to the same value as for the main mailbox (as a rule, it was so) and the transfer to another database worked. Of course, turning off the archive also works.

Remaining questions:
1. Will I break / break something in this way?
2. Judging by all the signs (see "What we have"), there were archives. Is there any way to find out their real location (in some more "low-level" way, because ordinary cmdlets do nothing but what we have) so as not to be left to chance by setting ArchiveDatabase the same as the main mailbox?

Answer 1

1. Will I break / will I break something in this way?

No. Archiving can be turned off/on at any time.

2. Judging by all the signs (see "What we have"), the archives were

show the output of Get-Mailbox -Identity mailbox | fl MailboxLocations ?
The archive database itself is generally alive, i.e. does an object with this GUID (cb90bc8c-2324-4868-a899-93428234f90d‎) exist in AD?
How was the archive box turned on and was the archive database assigned?