Hello,
When you say you want to share it with users in the same organization, they also need to reside in the same Zoom account. Some organizations are quite big and have multiple Zoom tenants/Sub-accounts, but this app will only work on the account it was built on until you either publish it or apply for a Beta Authorization URL. You can read more about this over here: A Clear Path for Every Developer: Beta URLs and Marketplace Publishing For Independent Developers (Sole Proprietors) - #2 by pranavgupta21