Clicking the "Test Endpoint" button returns a 400 status?

Question

message:"Requested resource not found"
code:"ResourceNotFoundException"
time:"2022-10-17T17:49:09.912Z"
requestId:"Q8RVNN693TH7PTB6PKEOKECL7NVV4KQNSO5AEMVJF66Q9ASUAAJG"
statusCode:400
retryable:false
retryDelay:21.930228216956916

Could someone help please?.

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Clicking the "Test Endpoint" button returns a 400 status?