Hi Justin,
Thank you for contacting the Microsoft Community.
I understand that you’re encountering an issue while attempting to book the AZ-900 exam, a crucial step in demonstrating your expertise. Let’s work together to try and resolve this issue.
We recommend that you do not use diacritics or special characters in the address section, as this is one of the possible reasons why you are receiving the error message. Additionally, if you are located in Canada or the USA, it is best to input only your state's abbreviation instead of the full state name.
For real-time assistance, you may also get in touch with Pearson VUE, and they will guide you in scheduling your exam. Below are their contact details:
Meanwhile, if you are looking to schedule an exam while applying for a company discount, kindly reach out to the ESI Support Team for assistance. I have already shared their contact details with you via a private message for your convenience.
If the issues persist after following the recommended suggestions above, kindly provide a step-by-step screenshot of the process using Problem Steps Recorder (PSR) (click this link for MAC device), starting from the sign-in page up until your unable to proceed scheduling your exam, along with the requested information through the private message I have initiated. This will allow me to further investigate your case and provide more options.
I hope this helps.
I look forward to your response. Please note that if no response is received after two business days, the case will be closed and locked. After the case is locked, we will no longer be able to respond, even through Private Messages.
Best Regards,