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My environment:

  • 1st VM/server: Active Directory Domain Controller
  • 2nd VM/server: SharePoint 2016 On-Premises
  • 3rd VM/server: Office Online Server (old Office Web Apps) also On-Premises - version from November 2017

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: screenshot

I have got also uploaded Office Excel Add-in to Apps for Office list in App Catalog, and it still does not work. Did I miss something in the configuration to allow adding custom add-ins?

bart
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1 Answers1

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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

Eugene Astafiev
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  • Eugene Astafiev, I saw that post already, but I don't use SharePoint Online or Office 365. I have updated my question with more details about the environment now. – bart Mar 31 '22 at 10:00
  • I think you have mixed SharePoint and Office add-ins at some point. – Eugene Astafiev Mar 31 '22 at 19:14
  • What do you mean? I want to allow installing Office add-ins in web/browser, so Excel document opened in browser from SharePoint list. That is why I am using Office Online Server: to open Office docs in browser, directly from SharePoint list (instead of desktop app). At the same time I want to instlal for that docs openend in browser, Office Add-ins uploaded to SharePoint AppCatalog. – bart Apr 01 '22 at 06:52