It is expected that your customer see 0 amount on the 3DS page. During that time, we are in the process of saving the cards, we also ensure the card is valid, not expired, and useable for online payments. Once validation is successful, the subsequent recurring are more likely to succeed.
Please be informed, that if you specify the plan to be immediately charged, we will deduct your customer based on the amount that you input during plan creation. You may refer to our docs here to learn more about 0 auth: