I have the same exact issue on MacBook Air running Catalina 10.51.1. I've had the MacBook Air since 2018 and Facetime and iMessage have never worked.
Mukondli
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I also started having the same issue this evening, the error persists even after multiple retries.
[!] Error installing FirebaseCoreDiagnostics
[!] /usr/bin/git clone https://github.com/firebase/firebase-ios-sdk.git /Volumes/workspace/tmp/d20230513-11348-iqm6nt --template= --single-branch --depth 1 --branch CocoaPods-9.2.0
Cloning into '/Volumes/workspace/tmp/d20230513-11348-iqm6nt'...
error: RPC failed; HTTP 502 curl 22 The requested URL returned error: 502
fatal: expected flush after ref listing
Error
Command exited with non-zero exit-code: 1
I also suspect it's a memory problem.