If the add-in is deployed to "Everyone" then there is no need to modify who has access to it. All users or Outlook will have the TonicDM add-in.
If you have deployed the add-in only to specific people, then there will be times you need to update that list.
Go to the Microsoft 365 Admin Portal (https://portal.microsoft.com/)
Choose Settings
then Integrated Apps
Select TonicDM from the list to open the right-side panel
In the right-side panel, choose the Users tab
Add and remove people from the Specific users/groups list
click Update to apply the changes
