Hi @ParaMaqui2017, welcome to the community, and congratulations on publishing your first course!
I'd recommend contacting our Instructor Support team here so they can confirm that the Tax team has received your form and make sure no additional steps are required from you.
I'm sorry to hear that some of your students are facing issues trying to complete the payment, you can refer them to this article: Troubleshooting Failed Payments. If the issue persists, please ask them to contact the Student Support team via this link and they'll be more than happy to provide personalized assistance.
I hope this helps!
Bella Almeida
Udemy Community
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