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Hello,
Some questions. If you run the deployment scanner on the EV server and check everything, does it come out with all green ticks? Especially the Exchange checks?
Items staying pending archiving mostly indicate an issue with the EV partition not being backed up. Depending on your configuration for the Vault Store Partition, you need to change the archive attribute, or use the triggerfile. Set, then clear backup mode.
It's been a while since I have done an Exchange migration, but I believe the order is:
Disable mailbox for archiving. Sync Mailbox using archiving task. Make sure the provisioning task is targeting the new Exchange server also. move mailbox. Run provisionning task with full report, verify report. Make sure the archiving task for the new server contains the PG. Enable the mailbox for archiving again. Run archiving task, verify archiving report. Do the mailboxes show?
I assume you have seen this one:
