I'm not familiar with Azure Update Manager, but in Edge if you want to disable auto update, you can configure this policy Update policy override.
You can enable this policy and set the option to Updates disabled. Please note that this policy is available only on Windows instances that are joined to a Microsoft® Active Directory® domain.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Regards,
Yu Zhou