Hery Seshta won't talk to me!

Okay, so there are no pre-reqs for gaining ML10 encounter credit. Why won't Hery Seshta talk to me? Does this mean I can't get on a boat and go to Ammut?

Hery Seshta is a bit of a perfectionist, and will only allow those who have successfully completed ML 5.1-8 encounters to use the Mask, Resin, and Wrap and become a mummy. Those who cannot be mummified are still able to board a boat and travel to Ammut to be judged. However, those not in mummy form will be unable to convince Aken to summon a boat for them and must board someone else's boat.