Hello,
thanks for your explanation.
I'm not able to provide any support bundle, because we are not yet using the M365 backup from Nakivo.
I understand from the following statement of the 10.9 Release notes in section "Microsoft 365", that the backup of "online archive mailboxes", is not supported in 10.9:
Backup and recovery of guest mailboxes, public folder mailboxes, online archive mailboxes, Group calendars, and Group planners, distribution groups, mail-enabled groups, security groups, resource mailboxes, read-only calendars, calendars added from Directory, event messages (that is, "#microsoft.graph.eventMessageRequest", "#microsoft.graph.eventMessage"), and outbox folders are not supported.
This is were I would like to know if this is on the roadmap or may be already in the 10.10 version.
Thanks,
Thomas Kriener