SharePoint 2019 Solutions with sandboxed code are disabled

Question

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?

Answer 1

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.

Source

Answer 2

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