I have been corresponding with Aeromexico for several days regarding this issue. I'm a travel agent who books a lot of Aeromexico tickets.
Aeromexico USA was 'quite surprised' to see this issue.
They refused to 'make a comment' but said it had been escalated to upper management and a resolution would be forthcoming.'
I wonder of this has anything to do with Aeromexico's emergence plan from bankruptcy; currently pending court approval under serious objections.
Something's seriously wrong!
Even pulling all J fares, they won't price quote it on SABRE / GDS