When migrating to Office 365 using Migrator for Notes to Exchange (MNE), the "Office 365 User domain" must be selected as part of the migration process from a drop-down list. There can be instances when a particular domain is missing from this list.
WORKAROUND 1:
Try logging into Office 365 using PowerShell and run the following command:
Get-AcceptedDomain | Where{$_.DomainType -eq 'Authoritative'}
This command will return only those domains which have been "verified" by Microsoft. If the missing domain is not listed, you may want to contact Office 365 support directly in order to determine why the domain in question has not been verified.
WORKAROUND 2:
The Office 365 User domain can be specified manually using the following procedure.
1.) Click the Edit menu | Select Global Default Settings.
2.) Locate the [Exchange] heading.
3.) Locate the "HostedDomain" parameter.
4.) Change the "HostedDomain=" value to the desired domain.
Example:
HostedDomain=example.com
5.) Save and Close the "notesmigmgr-edit.ini" file.