Always best to get things prepped and confirm you have the adequate permissions to your tenant
Confirm the following:
- Right permissions
- App Catalog
To confirm that you have the correct admin access, can you:
1. Goto your SharePoint admin center page: https://admin.microsoft.com
To confirm this, sign in to https://admin.microsoft.com as a global or SharePoint admin. (If you see a message that you don’t have permission to access the page, you don’t have Office 365 administrator permissions in your organization). Please speak to your internal IT.
You will need “Global administrator” level permission to access or create/use an app catalog site
2. Goto the Admin Centers page
2. If you don’t have an app catalog, create one. See these Microsoft instructions.
Each O365 tenant that has a working license of the installation will require an app catalog
Once you have the correct admin access and the app catalog is created you are now ready to start the installation.