RE: Migrating from Internal On-premises Exchange to Exchange Online

Hi cKevin,

What your understanding is right, the issue should be related to certificates.
I understand you want to install a “.com” version of the third party certificate and get the errors above.

Since we’re not familiar with the on-premises server settings, to get dedicated support, I suggest you open a new thread with the details in our Exchange Server Forum, your understanding is appreciated.

If you also have issue after intall the certificate, please feel free to let us know.

Thanks,
Jason Jiang