Firebase Unity issue on xcode

I need Unity developer to assist me remotely on my Unity project. On android it works fine. But porting to xcode has errors. Problem are Firebase plugins.
Pay after job done.
In the bid start with the error value I have (two words after Error:), so i will know you have read and hopefully understood the task.

OS Catalina 10.15.6
Xcode 12.4

Error:
Undefined symbol: _OBJC_CLASS_$_FIRInstanceID

ld: warning: arm64 function not 4-byte aligned: _unwind_tester from /Volumes/Storage/UnityProjects/xCode/ChakraHealing/Libraries/libiPhone-lib.a(unwind_test_arm64.o)

Undefined symbols for architecture arm64:

"_OBJC_CLASS_$_FIRInstanceID", referenced from:

objc-class-ref in libFirebaseCppInstanceId.a(instance_id_82ae987c36fa0dc659f00d4a5107df83.o)

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)