Like others have said above, looks like this tab has been renamed to "Integrations". And under "Integrations" if you are an Admin, on the left you will see "Keys" -> "App Store Connect API".
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In my case the issue was that I had 2 protocols, one extending another (I forgot what the Swift-appropriate term is), and I had two properties with similar name, but slightly different declaration. Like:
protocol A {
var field: { get throws }
}
protocol B: A {
var field: { get }
}
And the build just died (same symptoms: hangs forever, nothing helps). Once I removed one of the two properties, the problem went away.