To unapprove or unaward an advancement in Internet Advancement. First you need to Unapprove it, then approve it again.
Click on the Scout’s name in the roster in Internet Advancement
Click on the > icon next to the advancement’s name
Click on the three linear dots and click on unapprove
Confirm you wish to unapprove the advancement.
Then use the regular process to approve / mark awarded it again.