1. Start by navigating to your Office admin center.

  2. From there, open your SharePoint admin center by selecting it from the Admin Centers menu on the left.
    • If you're in the Modern Admin Center, you'll need to click Classic SharePoint admin center on the left hand side to proceed.

  3. Click apps on the left-hand side, then App Catalog to bring up the creation form. If instead of a form a site opens up, that means you already have an app catalog and can proceed to the next step.

  4. Fill in all the necessary information and click OK. Please note it can take 5 – 10 minutes for the App Catalog to create.