Need help linking a Robinhood account to Profit.ly. The account number is found on my account statements, yes, however it is a ten character format such as XXX-XXXXX-XX while Profit.ly requests the format 10-XXXXXXXX.

What does 10-XXXXXXXX mean? Do I use the digits 10 and then first 8 digits of my account number? Or do I change the given format? I've tried almost every possible logical configuration and it all has failed. Please comment if you are a Robinhood user...