403 Exception on Fetching Firebase ML Model in Production

Question

Getting a strange 403 exception when trying to fetch our Firebase ML model in production. Not sure why, in our debug build it works just fine (it's a separate firebase project), but pretty much identical to production in terms of setup. There shouldn't be any issues on the authentication front, and our models are definitely uploaded to Firebase ML as custom models, and the google-services.json file is up to date. Any leads on what this may be? Very confused why this is happening

com.google.android.gms.tasks.RuntimeExecutionException: uk.c: Permission error while fetching model (insufficient-photo): HTTP response from Firebase Download Service: [403 - Forbidden: Requests from this Android client application <empty> are blocked.]
                                                                                                at com.google.android.gms.tasks.zzw.getResult(com.google.android.gms:play-services-tasks@@18.0.2:6)
                                                                                                    at a60.b9.h(PhotoUploader.kt:11)
                                                                                                    at a60.b9.c(Unknown Source:0)
                                                                                                    at a60.a9.onComplete(Unknown Source:2)
                                                                                                    at com.google.android.gms.tasks.zzi.run(com.google.android.gms:play-services-tasks@@18.0.2:22)
                                                                                                    at android.os.Handler.handleCallback(Handler.java:942)
                                                                                                    at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                                    at android.os.Looper.loopOnce(Looper.java:201)
                                                                                                    at android.os.Looper.loop(Looper.java:288)
                                                                                                    at android.app.ActivityThread.main(ActivityThread.java:7918)
                                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Checked the Firebase access permissions, and it looks like Firebase ML should be accessible.