When the user cancels the credential chooser (i.e., the platform returns an empty response), CredentialRequestCoordinator::handleDigitalCredentialsPickerResult() (line ~204) rejects with AbortError: return dismissPickerAndSettle(Exception { ExceptionCode::AbortError, "User aborted the operation."_s }); Per the spec's "initiate the credential request" algorithm (step 3c at https://w3c-fedid.github.io/digital-credentials/#initiate-the-credential-request): "If the user cancels the operation or no credential was selected: Let error be a newly created "NotAllowedError" DOMException." The error should be NotAllowedError, not AbortError. AbortError is reserved for AbortSignal-driven cancellation. Fix: Change ExceptionCode::AbortError to ExceptionCode::NotAllowedError at the empty-response check in handleDigitalCredentialsPickerResult (or its renamed equivalent after bug naming alignment).