I've scheduled a tenant-to-tenant migration for this weekend and anticipated it would be straightforward. I'm following a guide from CodeTwo, along with Microsoft's documentation. At the moment, I'm testing server availability, but I'm encountering an error that says the connection to 'outlook.office.com' couldn't be completed. Here are the error details:
- Result: Failed
- Message: The connection to the server 'outlook.office.com' could not be completed.
- SupportsCutover: False
- ErrorDetail: Microsoft.Exchange.Migration.MigrationServerConnectionFailedException, indicating access is denied.
This is an Exchange Online to Exchange Online migration. I believe my credentials are correct, but I wanted to mention that the source tenant has security defaults, which I cannot modify. Anyone else faced this issue?
3 Answers
Even if your credentials are correct, make sure they have the right roles assigned. You'll need the Migration Administrator role to facilitate migrations. We found that it works well in our environment without giving full Exchange Admin or Global Admin permissions.
Does anyone know if CodeTwo can work with security defaults still turned on? I had an issue with BitTitan when I tried migrating with security defaults, and it really caused me some headaches.
I used CodeTwo for my migration and remember needing an app registration in each tenant. You'll need to log into the original tenant to grant access to the app registration. Their tool was really user-friendly.
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