Help Bulid ipa on Xcode(1) -- 3

Now I need your help to build ipa on Xcode This is chatting app, built with cordova+vue I used cordova-plugin-fcm. ([login to view URL]) app is built now, but can't get noficiation from firebase. while app running, I noticed subscribing fail issue. This is the error log: <FIRMessaging/WARNING> Failed to subscribe to topic Error Domain=[login to view URL] Code=5 "(null)" Please fix this issue, so I can get notification from firebase. work will be through teamviewer. (this is a maximum of two hours of work) budget is $50 for now this will be long-term project. There are many parts remaining we have to do. Thank you.