Enrolling family members must have lived with sponsors at the overseas location. Sponsors must have at least 12 months left in their active duty service commitments. Sponsors must complete enrollment election within 30 days of signing in at their new duty stations. Service members should enroll their family members in the dental plan at least 30 days before leaving the overseas duty station. This will provide earlier access to dental care.
Coverage is effective the month after service members complete enrollment.
They said earlier versions of the enrollment forms don't contain required enrollment codes.