Reusing voucher after canceling exam

I think that there is no problem as long as the voucher does not exceed the deadline as described in the document below.
https://aws.amazon.com/certification/policies/before-testing/?nc1=h_ls

Please note: You can reschedule your exam up to 24 hours before your scheduled exam time. Each exam appointment can only be rescheduled twice. If you need to reschedule your exam a third time, you will need to cancel your exam and schedule it for a more convenient date. If you paid for your exam using a voucher, verify the voucher expiration date prior to modifying your existing registration. Exam voucher expiration dates cannot be extended.

Yes, you can reuse the voucher immediately after cancellation. In my case, the voucher was issued by my organization and was valid for next 1 year.

When I cancelled my appointment, I received a cancellation confirmation email saying "If you paid for your cancelled exam appointment with a credit or debit card, you will receive a full refund. Please allow up to 7 business days for the refund to reflect on your account depending on bank processing times. If you used a voucher to schedule this cancelled exam appointment, you are now able to use that voucher again to schedule a new exam appointment as long as the expiration date of the voucher has not passed".

I could schedule the exam to another date, immediately therafter.