"Your administrator has not installed Web Add-ins for your organization" when try to add Office Add-in for SharePoint 2016 + Office Online Server

Bart 1 Reputation point
2022-03-30T11:27:59.177+00:00

My environment:
SharePoint 2016 + Office Online Server

Done already:
Communication between SharePoint and OOS. I have also custom Office Excel Add-in uploaded to Apps for Office list in App Catalog site. Add-in itself should be fine - it works in other environment.

Issue:
When I try to install add-in in Excel in web/browser, I'm getting "Your administrator has not installed Web Add-ins for your organization" message:

188412-image.png

Did I miss something in the configuration to allow adding custom add-ins?

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Microsoft on-premises server product that runs Office Online. Previously known as Office Web Apps Server.
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SharePoint Server Development
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  1. Eugene Astafiev 891 Reputation points
    2022-03-30T21:15:57.02+00:00

    I suppose a sharepoint catalog and app store add-ins are mixed in you post.

    Instead of uploading the add-in Office 365, under Setting>Service & add-ins, try uploading the add-in in SharePoint Online Add Catalog site. To do this, please follow the steps below:

    1. Sign in to Office 365 portal with admin credentials.
    2. Go to Admin Center>SharePoint Online Admin Center.
    3. Once you are in SharePoint Admin center, go to App Catalog site, URL should be something like https://tenant.sharepoint.com/sites/AppCatalog
    4. Click Apps for Office on the left navigation panel to upload the add-in for Office apps.
    5. Click Upload and browser the path where the custom add-in is saved on your system.

    See Excel does not show Office 365 custom add-in for more information