Hi @wendy.edwards,
Welcome to the Auth0 community!
Unfortunately, duplication of a tenant is not possible according to the public policy. This is valid for both the Private and Public Cloud customers.
However it is possible to migrate data from one tenant to another using specific tools. You can find all the information regarding the transfer of data in the following Knowledge Solution: How to Clone/Duplicate Tenant
I hope this helps you and feel free to come back if you are having more questions.
Thanks,
Tudor