Just wanted to share my results as well:
So when using the older xcrun altool, I don't get the 500 error, and when using the Xcode notarization GUI I don't get the 500 error.
However, as soon as I try and use the newer xcrun notarytool I get the 500 error (I'm specifically passing in an Apple ID/Team ID/App-Specific password). I also get the same 500 error when I attempt to perform a store-credentials command with notartytool.
Seems like this is a recent serverside issue, as this is happening across Xcode versions 13.2.1 and 13.4
nickmcdonald
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