Not able to trade Call and Put credit spreads

Hi IBKR Fam,

I have a cash account (below 2K USD) and I am unable to trade either Call or Put credit spreads on SPY ,

I get the following message :

"BUY 1 COMBO" We are unable to accept your order.Your available funds are insufficient to cover the change in accounts margin requirements if this order executes. In order to obtain the desired position your Equity with loan value (1800 USD) must exceed the new total initial margin of (55,500 USD)

Where as the max loss if i take a PUT credit spread position is 366 USD.

Thanks.