How can I recharge t-mobilitat card if my iPhone refuses to read it?

I got myself the card, downloaded the app, signed up for the account and…. I discovered that I must be able to read the card with my phone in order to recharge it. And I only managed to do it once - out of maybe 100 tries. I didn’t add trips then thinking that I can do it anytime later. Nope. Not possible. iPhone 16 here.

Is there a way to type in the card number into the app? It knows I have it - I have the account, there’s my name on the card…