Deleting an app message from a Microsoft Teams channel is possible, but requires specific permissions from your Microsoft Teams Administrator.
Once a recognition message is posted in a Microsoft Teams channel, the message can be deleted, but specific permissions may be needed to do so. See below on where to find the delete option for a message in Microsoft Teams.
If you don't see this option in the drop down menu, then you do not have the appropriate permissions within Microsoft Teams to delete app messages. Coordinate with your IT department or Admin to obtain them.
Deleting the app message will not delete the recognition from Preciate's system.