Firebase setup for ios expo react native messaging

I am a software developer, I have configured firebase with Android and it is working fine, but I am not able to configure firebase for ios in the same code. i have followed all the steps and build is generated successfully, even I am getting the token properly, but I am not able to get the notifications. I am using react native firebase messageing in expo. I want someone to help to fix this issue and give me a document with the mistake i was doing and the fixs.