Please check your balance as often the cause of that payment failure will be insufficient balance.
When you open your Revolut Pro account it will not have any money in it as it acts as a separate account from your retail one. You need to add money to your Revolut Pro account before doing a first payment. Not sure how to do that? Please check this article.
Your personal Revolut account and your Revolut Pro account are two separate accounts: if you don't have enough money on your Revolut Pro account, the payment will fail even if you have money on your Revolut personal account. You need to add money to your Pro account before making payments.