I have a SharePoint 2019 server with a single server farm role. I have enabled the sandbox code service following these steps: enable-sandbox-solutions-on-sharepoint-2016 When I upload a sandbox solution containing a workflow the activate button is enabled. When I click activate I get the ULS error: "Solutions with sandboxed code are disabled" And on screen "Activation of solutions with sandboxed code has been disabled"

any ideas?

When I create a new Sandbox solution in Visual Studio and upload this to my site I can activate the solution.

Are workflows no longer allowed in Sandbox solutions?

2 Answers 2


I think, the code-based sandbox solutions are no longer going to work in SP 2019. It's one of the most promitent things removed in the latest sever version of the product:

After careful consideration, we've decided to also remove support for code-based sandbox solutions in SharePoint Server 2019. Customers are recommended to explore SharePoint add-ins as an alternative, which are fully supported for both SharePoint on-premises and SharePoint.


  • 1
    Are Sandbox solutions with a workflow considered as code-based then?
    – Danny
    Jan 14, 2021 at 8:30
  • As long as a workflow is part of a sandbox package - then yes. I think, even if a workflow has no custom actions, it's still going to be considered code-based. Jan 14, 2021 at 8:42

I agree with Denis, as mentioned this feature has already been removed in SP 2019.

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