Teleport to friend disappears after it fails
It’s a known bug and seems there won’t be a fix for it. At least not anytime soon. You can contact support with a ticket if you post when you used it so they can check and refund it for you.
Contact support with a ticket? Is that the same as the in-game bug report? If so, then I’ve submitted it. If not, any ideas on how to submit a ticket? The system for GW2 support seems to be well hidden…
You can contact the CS Team via the ‘Support’ link above/below and ‘Submit a Request’ for assistance.
Good luck.