While applying Quality Update 10.0.46 in a Dynamics 365 Finance and Operations (D365FO) environment through Lifecycle Services (LCS), you may encounter an error related to the DVT script during the servicing process. One common error message is: DVT script for service mode: AOSService on machine.” When you dig into the logs, you might also see the following detailed exception: ERROR: System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. This issue generally indicates that the SSL certificates used by the environment are either expired, invalid, or out of sync—causing trust failures during communication. Fortunately, the fix is straightforw...