IBKR always says I don't have enough cash settled to make a trade. WHY?

No that shouldn’t matter.
Mobile app uses IdealPro (afaik) and it flows in one go chf-usd-buy for me too (like others).
Not sure what the cause for the OP and some others might be. :confused:
Could it be that after a number of trades this time limitation disappears? :grin: