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For private goups (teams) to backup service account should have the owner rights so if team mailboxes are added as a content in the sublclient then while backing up we have to added service accounts as OWner of those teams.
from the subclient MB list remove these team mailboxes to not to assign the rights.
i hope this will help you to understand ...
CvRecallMailbox.exe on V9 proxy server will not help in this case.
better to move to sp11 and then from the v11 classic mailobxes agent proxy server run the CvRecallMailbox.exe tool.
Only for restore to PST and MSG we need OL .
Rest of all other operations can be done with out OL using EWS.
Going ahead we would be movign with ews and remove the dependency of any Outlook version.
So from sp18 with out OUTLOOK we will backup the MB data using EWS.
which is already in-place for Exchange 2019 from sp16.