Lot money amount

Hello all,
I have a question. I set up a commission trading account with leverage x30 for trading (my first real account ever) after I demo trade for a long period of time and found my tactic. So I set up my account and I put 100$ in account.

Why when I wanted to buy 0.1 standard lot it said I don’t have required funds? Basically, I should be able to buy a position almost worth of 3k, right?

Is there a place where I can see how much I can buy with a certain leverage and a certain amount? Is really annoying, it would have been my first real trade and a winner and I just got stucked.

Thank you for your kind help