Unable to parse response (syntax error: line 1, column 54), invalid XML received:
b'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n<title>500 Internal Server Error</title>\n<h1>Internal Server Error</h1>\n<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.</p>\n'```
Non-localstack calls to this method fine with same parms
Maybe method not implemented because it's new-ish?
response = iam_client.list_service_specific_credentials(UserName=username)yields: