Tag not monitored by Microsoft.
Hi Bharath Chandra Kare. Thank you for posting here in the Microsoft Community. I understand that you are unable to schedule the AZ-400 certification exam since you are encountering an error when adding your address, which is preventing you from proceeding. I'll let you know what caused this error message, and I’ll guide you on what to do next.
Just to let you know that the error message that you are receiving when you are trying to schedule the AZ-400 certification exam is because your account has been blocked by Pearson Vue which normally happens because of multiple failed payments. You need to contact Pearson Vue support using the link on https://aka.ms/CertificationSupport to get the block lifted.
After Pearson VUE confirms that the block has been cleared, everything should work as expected.
Thanks for reaching out today. I hope this helps you.