Hi! Dynamics 365 PSA v3 just hit v3 lately and here’s how you can get it.

1. You’ll need to be an Insider program member to be able to subscribe to the GA program.
   Dynamics Insider Program
   
2. Look for the D365 For PSA Unified Interface Program
   
3. Signup Link on the details section
   
4. Fill out the form which asks your info about the tenant details and you can get your D365 PSA v3 GA on your tenant in a day or two.
   

Hope this quick one helps you. 🙂