Azure Virtual Desktop - use both Microsoft 365 license and per user license on same subscription

I'm assuming when you say "per user pricing", you're referring to https://learn.microsoft.com/en-us/azure/virtual-desktop/enroll-per-user-access-pricing.

I'm not sure why you're getting some "yes" answers here, but the answer is very much "no".

There's a couple of reasons for this:

1. The configuration is set per-subscription and there's no way to configure more granularly. That means that users coming in with a Microsoft 365 license are effectively being double-charged for the AVD access - once for the part that's included in the M365 license, and once for the per-user license meter (counter) on the Azure subscription.  This point basically gets you to a "no" from a technical viewpoint.
2. Per-user licensing is explicitly for external customers accessing an AVD solution you are hosting.  Licensing Azure Virtual Desktop | Microsoft Learn gets into this pretty clearly, Your use case is not completely clear to me but it sounds like you have users performing internal business functions (e.g. contractors, front line workers, whatever), which means they are like Fabrikam or Wingtip Toys on that page, The per-user license is for the Contoso use case - a software vendor selling access to their Windows application hosted in AVD.  I think this point basically gets you to a "no" from a proper licensing viewpoint.

If I misunderstood your question, please feel free to clarify.

Thanks!