You can’t use the domain because it’s not an accepted domain

After moving several users successful from Exchange 2013 on-premises to Office 365 at one point the migrated stopped (for some users) with the following error message: “You can’t use the domain because it’s not an accepted domain for your organization”:

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The call to mrsproxy.svc failed. The HTTP request was forbidden

Recently I was doing a project with Exchange 2013 on-premises and Exchange Online in a hybrid configuration (with ADFS etc.). Exchange 2013 was connected to the Internet using a (Juniper) firewall, so no TMG involved. Exchange 2013 was functioning properly.

Continue reading The call to mrsproxy.svc failed. The HTTP request was forbidden