That still doesn’t really make sense. Why not run SLAAC on one subnet and have a single firewall rule for the whole thing? You’re not running any major servers on an Android phone, so it won’t be anything complex.
SLAAC can only run on a subnet that's larger than /64, which they might not have access to.
SLAAC can only run on a subnet that's larger than /64, which they might not have access to.