Completely new here (and new to the status hobby) - so roast me if you will

I apparently have Oneworld Sapphire by being AA Plat status. I transferred credit card points for IB avíos and plan on heading to Spain next year with my gf.

On the app, it automatically enters my IB plus number but I only have AA status.

I don’t really care about the luggage, but I would like the ability to pick my seats and possibly check out a lounge or two.

How can I ensure that I can partake in these perks?

Thanks in advance!