Immediate transfer for Fortnite Save the World Power pack not working?

Today I actually wanted to buy the Save the World Power Package from Fortnite via instant transfer.

But I'm not forwarded anywhere when I press the "Submit order" button. (After ticking the box immediately, of course)

If I now however on zb. Press PayPal, will I be redirected to checkout immediately?

Please enlighten me here!

Do you play on PlayStation? I had the problem at least once. Then I just opened the PlayStation Store on my pc, deposited the credit via instant transfer and bought Vbucks with this credit. Hope could help you

It worked, thanks!