Hi @Ames Trebing ,
I've never tried to migrate a VM from Xen to Azure using Azure Migrate so far.
Based on the documentation it should be possible with Azure Migrate: Migrate machines as physical servers to Azure
The VM on the Xen server will be treated like a physical server.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards Andreas Baumgarten