Changing bundle ID for Firebase

The above answer may have been correct at the time of publication but what helped me was changing the bundle identifier in the Signing and Capabilities settings of the Target. Then, I went to the GoogleService-Info.plist file and I changed the value for BUNDLE_ID. Then, I hit Command +B to build the app and I ran the app. It worked just fine for me and I didn't get any errors.

The solution was to create a new app within the same firebase project