Meta Avatar Editor Integration during Runtime via Deep-linking

Hello, I'm using the meta All in one SDK  (including meta avatars v29). I want to integrate the meta avatar editor within my app. I'm following this documentation provided by meta https://developers.meta.com/horizon/documentation/unity/meta-avatars-editor-integration/ (SS attached)

2nd Screenshot is of the sample script provided by meta for launching. 

I've also added in an entitlement check within my meta app but when I run the sample scene (provided by meta) after building it to my quest, , I get an error: " Failed Entitlement check 7 - user doesn't have app in library" and I think due to this reason the editor does not get launched within the app. 

I have added in the app key from the developer dashboard but still not working even though I'm using the same account on my quest as on my developer dashboard. 

Does anyone have experience integrating the avatar editor within their app?  How did you make it work.

2nd Option: Is there a way to launch the avatar editor without an entitlement check? I can simply use preloaded avatars for that maybe?