You observe agents shown in the Enforce Console in Critical or Warning status and the agent events contain a recent 'Chrome|Edge extension not deployed' event, such as shown below:
There are multiple reasons that this could occur:
DLP 15.8 and higher.
If you are experiencing LGPO corruption, work directly with Microsoft to resolve it: Detecting Local Group Policy corruption
If you are managing browser extensions via GPO or other Endpoint Management methods and browser detection and URL recognition are functioning correctly, you can safely ignore this. This is working as designed to let administrators know that the DLP agent was either not able to deploy the Chrome/Edge extension, or that the agent was unable to detect the extension as having been deployed manually.