Hi @testuser7 ,
Thanks for your post! It is not currently possible to mix PTA and PHS in one tenant and enable them at the same time. This is because it is only possible to configure these methods via Azure AD Connect, and it only allows you to complete this configuration at the per-tenant level.
If you have a business case for this requirement though, I would be happy to share this with the product team. There have been some requests in the past for tools that would allow such a thing, but an ETA has not been shared. You can also leave feedback in the Ideas forum. https://feedback.azure.com/
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