Overview:
The Previous Page and Next Page links are not showing when querying users using the Vault API.
Root Cause:
This is working as designed. Vault does not support pagination information on the User object since it is handled differently than other Vault objects.
Solution:
The solution is to use the OFFSET token in order to return further user information when querying users using the Vault API.
Related Documentation:
Vault API Documentation: Paginating Results