Hi MichaelHofrichter,
To check the issue, please run the following cmdlet, and provide the result via private message. I will check if the local attribute is synced to Office 365 successfully.
On premise EMS:
Get-mailbox –identity user@domain.org |fl
Exchange Online PowerShell:
Get-recipient –identity user@domain.org |fl
To see the private message, please perform the following steps:
1. Please go to "Your details" section on the right side of the community site.
2. Click Private messages.
3. Click the subject title (request outputs) of the response to read the message.
Regards,
Johnny Zhang