We have created a event subscription and when Qualtrics receive the response, the subscription will call our third party’s api (https://******/******/services/apexrest/survey/response/event). This process didn’t works from last week and the log as below: 

{\"message\":\"Unable to send message to https://******/******/services/apexrest/survey/response/event (scope: ******dev, topic: surveyengine.completedResponse.SV_************)\",\"httpStatus\":401}

Does any one know how to deal this issue?