Step1 : sing up for account using your company email id
My.nutanix.com
Step:2 click on sign up now
Step:3 once your account got created, login to it and click on Nutanix university
Step:4 click on certification
Step:5 click on NCP
step:6 click on NCP exam
Next select schedule exam
click on exam schedular
It will redirect to PSI site as shown below
Use Voucher code: NTX90B20 on payment screen