Got it running with Avatars in Quest and Rift connecting trough each other. Had to set up both Apps on the oculus backend, add both App ids to the config, had to upload a build to the quest release channel to get trough the verification process that crashed my quest app. And also combined both apps with the new grouping method on the backend.
Now i can deploy from editor and join with the quest to the rift and vice versa!
App crashes on Quest: On Teleportation, On Grabbing Objects
No voip working yet between those devices.
(i also disabled package all assets to the apk, so that my app generates an obb for the bigger assets)