Most commonly, a Location can not be removed from a Location Group if it's associated to an active redeemable or campaign. When trying to delete the location, if the location group is being used with an active redeemable or campaign, you'll see the following error:
From the location group, go to Menu > Edit > Associations. This will list the campaigns, redeemables and segments using the Location Group that you're trying to delete.
To see if the redeemable is Active or not from this list, you'll have to click the link to the redeemable. Once in the redeemable:
Click on the 3 Dot Menu - if you see 'Deactivate" then the redeemable is currently active.
Note: Redeemables that do not have the specific "Deactivated" status, play a role here. For example, if a redeemable has an Expired status, it's still active.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)