Repository sync task is failing with error: proxy username and password can only be specified together

Issue

• Repository sync task on the Satellite server is failing with below error:

  PulpRpmClient::ApiError
  
  Error message: the server returns an error HTTP status code: 400 Response headers: {"Date"=>"Sun, 26 Mar 2023 08:59:19 GMT", "Server"=>"gunicorn", "Content-Type"=>"application/json", "Vary"=>"Accept,Cookie", "Allow"=>"GET, PUT, PATCH, DELETE, HEAD, OPTIONS", "X-Frame-Options"=>"DENY", "Content-Length"=>"83", "X-Content-Type-Options"=>"nosniff", "Referrer-Policy"=>"same-origin", "Correlation-ID"=>"74e2c018-8a64-4315-aecf-a3db8fecde97", "Access-Control-Expose-Headers"=>"Correlation-ID", "Via"=>"1.1 satellite.example.com", "Connection"=>"close"} Response body: {"non_field_errors":["proxy username and password can only be specified together"]}