It looks like SAP made some changes so it is no longer possible to use trial accounts. See the statement in the Academy Learning Path.
You will need to make sure your organization has the correct access.
Hi, it seems you do not have any organisation assigned in EU Frankfurt region. Now a days trial account does not provision in AWS Frankfurt region.
You can check your trial account region by login to SAP BTP cockpit. You need to login to same region from Developer portal in order deploy application to SAP BTP.