@samgbuyi Firmware 14.39 or 14.40 has many issues resolved with respect to AMP. So, upgrade the MX to one of those and test again. Also, whitelisting a client bypasses AMP. So, you can whitelist temporarily until upgrades are complete and change back to normal
There was a specific issue in the last 7 days when a bad signature was pushed out that triggered on a Microsoft update. It affected a lot of MX customers. That signature should now be fixed, so you should be able to turn everything back on again.