My credit card is not being added to my account

[hejsan]

Same as

flyctl keeps on asking for a credit card although I provided one already

I just registered on fly.io via my github account. When trying to deploy the test app (hellofly) the system keeps on asking for a credit card. I enter the data concerning the credit card and the system accepts it (it is not a payment card and the green tick appears). However flyctl continues to show an error and asks for the credit card or buy credit. Do I have to buy credit also if I am on the hobby plan and will probably never go out of the free allowances?