Had same issue. When tried to build Pods separately - got issue like this. - https://developer.apple.com/forums/thread/660758 Rewrite code to resolve pods compilation issue.
to resolve arm64 issue I've added .xcconfig file:
#include "Pods/Target Support Files/Pods-Frameworx/Pods-Frameworx.debug.xcconfig"
EXCLUDED_ARCHS[sdk=iphonesimulator*] = arm64
ARCHS[sdk=iphonesimulator*] = x86_64
VALID_ARCHS[sdk=iphonesimulator*] = x86_64
Kirow
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Just tried another solution - https://developer.apple.com/forums/thread/656509 that helped - removed VALID_ARCHS setting from .pbxproj