Ccode":403,"message shows only on phone browser

Hello everyone, I was able to deploy my app and it works in the ai studio builder and also it works when deployed on google cloud on my pc browser. But when i try to use it on my phone it gives me this error, any ideas why this happens only on mobile devices?

Al reasoning failed: {“error”:

{“code”:403,“message”: "Method doesn’t allow unregistered callers (callers without established identity).

Please use API Key or other form of

API consumer identity to call this API.",“status”.“PERMISSION_DENIED”}