I've seen other posts related to this and still cannot get it to work correctly.
The way I was trying to do this was to display a different button depending on group membership. My conditional rule is:
Unfortunately, the button is still hidden even if the person is in this group. What am I doing incorrectly here?
have you spelled group name correctly?
copy over rule's formula to a calculated value control a check how does it evaluate.
check developer console for any errors.