fwiw, today I handed over a Travel Card (the brownish one) at checkout on my stay.

The Front Desk Mgr said that she would do her best to apply it but that there had been a recent change with the the way they needed to process them

She explained that in the past, all they needed to do was swipe the card & apply it like they would a credit card but now they need to go through several steps including making a call to get an authorization & this process did not always go smoothly.

Since I wasn't in a hurry, I left her the card to work on it & when I saw her a few hours later, was told she was able to apply the Travel Card to my bill. ^

fwiw, my reservation included both a LNF & BOGO