Automatic Revalidation Travelling to Cancun from US : Question

H4-EAD
4

That means the morons dont know the CBP rules. Try your luck again at different time/date if it a short drive from where you live.
Cancun will work for sure however make sure you have a valid Mexico tourist card (FMM) as your US visa is expired.

https://forum.am22tech.com/t/mexico-cancun-travel-experience-for-i-94-extension-imp-please-read-bumpy-ride-happy-ending/122100?u=kalpesh_dalwadi