From experience, and for serious matters, I don't trust what anyone from support says. You have to go to the documents, the law.
I hope holydarkness can do something for you, but your story doesn't look good. You know you're a tax resident in the US, and traveling doesn't change that. Then you have gambling debt. In short, it looks like you have problems, you're running away from them, and you've found more problems.
The restriction is on country not on citizenship of players

. ? If so, where's the problem?