You have noticed the following while running Windows Assessment Scan:Failure with Exit Code -2147418113
ITMS 8.x
Signing certificate issue.
This particular message is related to our Patch Data updated requirement for certificates. If your endpoints have consistent access to the internet, this will not be an issue for you. However, if your endpoints are mostly disconnected or have intermittent internet access, you will need to follow one of the methods below deploy/install updated certificates.
Follow the same steps as mentioned in the below article for this error as well:
Windows System Assessment Scan fails with Exit Code: 4