I get users, just never more than 99.
curl-H "X-Samanage-Authorization: Bearer xyzxyzxyz"-H "Accept: application/vnd.samanage.v2.1+json" -H"Content-Type: application/json" -X GET https://api.samanage.com/categories.json
Check this page on the API documentation page, your data may be being divided into pages: https://apidoc.samanage.com/#section/General-Concepts/Pagination
Well, that was a face palm moment for me! Thank you!!