Trying to buy some Doge and decided to use this app... I was able to make the first purchase easily a few days ago. Decided to invest more but the app now says that my bank is denying it for potential fraud. I called the bank and they said they can't see anything on their end and it doesn't even show up! So... what could the issue be? I've tried both me and my husbands debit card and it keeps doing the same thing even though we've spoken to the bank twice now.