In order to cancel a pending group invite, or delete any other invitation from the list of users in your private group from an Android device Glympse version 3.20 and above:
1. From the main map in your Private Group page, navigate to Private Group details page and tap on the 3 vertical dots in the top right corner of the screen:
2. Click to 'Edit Group'.
3. Next, a list of invites (expired) and pending invites will appear. Tap on the invite you would like to cancel or delete, and then tap on the trash can.
4. Tap the "Remove" button.
5. The Invites list will be updated and remove the user's invite from the list.
6. The user will no longer be able to access the Private Group.