My guess is that the bonus flag comes from the fact that you (or the other player) had a bonus at a different Rival that had not been cleared.
This has happened to me and that was the final reason. (my account was not locked however) In fact I got offered a Birthday Freebie that I was not allowed to take because I had a bonus that I had not completly played off at a different property. (even though I had already met the wagering requirements of the other bonus, since the account was not clear I couldn’t take another bonus….I had to lose the money left in the account or win enough to get above the withdraw limit so I could clear the account in order to be eligible for a bonus at a different casino)
I don’t hold this against the property or Rival, but I would like to see the issue fixed.
I actually had one customer service rep tell me in a chat that this is a very common problem among different Rival Casinos.
Rick
Universal4
Now if this is not similar to your situation, I apologize for interupting this thread.