API key connection issue with App Store Connect

I’m trying to connect Median with my paid Apple Developer account, but I keep getting the error: “The API keys are either invalid or have been revoked.”

I already created a brand new API key in App Store Connect (with App Manager role), copied the correct Issuer ID and Key ID, and uploaded the fresh .p8 file without editing it. Still the same error appears.

Is there something specific Median requires for the App Store Connect API key setup?

Thanks in advance!