Guild Wars 2

Summoned a one time user merchant express in a friends instance on my level 80 while hes low level because my personal inventory was full, and the merchant wouldnt respond to me, but he would respond to my friend…i wasted it…

was in the windrock maze for charr instance, i was human hes charr.

That is an odd oversight in Merchant behavior. Have never seen this reported before.
Good catch.

It’s strange that access would be limited to the Personal Story instance owner instead of accessible by all players as Merchants usually are when summoned elsewhere.

If you really want to see if they will refund you a replacement merchant express, you can submit a support ticket and explain that this bug prevented your use of the merchant in that environment. Perhaps they will reimburse you and you will get a replacement in your in-game mail.