USE master;
GO
SELECT SUSER_NAME(principal_id) AS endpoint_owner
,NAME AS endpoint_name
FROM sys.database_mirroring_endpoints;
GO
-- change the endpoint owner
USE master;
GO
ALTER AUTHORIZATION ON ENDPOINT::Hadr_endpoint TO sa;
GO
-- grant connect
GRANT CONNECT
ON ENDPOINT::Hadr_endpoint
TO [yourdomain\username]; -- account used for the SQL Service
您能否确认您在端点上拥有正确的权限?