I'm thinking Member Tools may be playing gatekeeper and needs to be updated.
For the actual scheduling, Tools is just an automated web bookmark. It sends you to the same place as if you went to the church main page and selected "Temple Appointments" from the Resources link.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.