@Martin Little ,
Are you using the Configuration Manager version 2002 or later?
In version 1910, when Microsoft Edge is deployed, the installation script turns off automatic updates for Microsoft Edge so they can be managed with Configuration Manager.
Starting in version 2002, you can create a Microsoft Edge application that's set up to receive automatic updates rather than having automatic updates disabled. This change allows you to choose to manage updates for Microsoft Edge with Configuration Manager or allow Microsoft Edge to automatically update.
When creating the application, you can deselect the option Allow Microsoft Edge to automatically update the version of the client on the end user's device on the Microsoft Edge Settings page.
It may help you to control the automatic update of the Edge browser.
Reference:
Configuration Manager version 2002 and later
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