I'm looking for a broker where my 18 year old son can trade option spreads. He's been learning & trading options with me for the last two years. He knows his way around defined risk strategies pretty well. He opened an account with TDA to use the ToS platform right after his birthday. Unfortunately, although TDA has a promotion through tastytrade to get young people trading, they will not approve his account for spreads. (tier 2 margin) The permission denial was not specific, just "request refused" form letter with "you are welcome to apply again in 90 days". No clue if they think he is too young or the account capital was too low ($8K). Any recommendations? His trades are in the 1 to 5 lot range so he wants to avoid ticket charges.