Dynamic Client Registration - PSD2

I’m getting following trying to register a new client
{
“error”: “invalid_request”,
“error_description”: “Failed to parse and validate request JWT: bad_request.aud: Invalid aud”,
“error_params”: {
“original_error_code”: “bad_request.JWT”
}
}

what would be a valid ‘aud’ be?

Hi, try set "aud": "730427" which is ASPSP Registration ID