Sharepoint - Error: The option for the SharePoint 2013 Workflow platform is not available in SharePoint designer
what version of sharepoint are you using?
The steps in this article apply to SharePoint Server 2013. The SharePoint 2013 Workflow platform is not supported in SharePoint Foundation 2013.
goto Configure Workflow Manager to work with the SharePoint Server 2013 farm within the link below.
http://technet.microsoft.com/en-us/library/jj658588.aspx
above is step by step tutorial to get it working!
iv noticed that your doing part of the step posted in the link! what error are you getting when running the powershell script?
EDIT
you still havent told me what error your getting within the powershell script?
if its because its already bound than use force! the spsite is the site collection you want to bind the workflow service too, the WorkflowHostUri is the workflow service url where it resides, goto iis and find the workflow service under sites and see the url by browsing! copy the url into the powershell command below, the spsite you could do the same or just navigate within your browser to the site, copy the url and past it below:
Register-SPWorkflowService -SPSite 'https://myhost/mysite' -WorkflowHostUri 'https://workflowhost' -AllowOAuthHttp -Force
as per your example it would be:
Register-SPWorkflowService -SPSite 'https://sharepoint.example.com' -WorkflowHostUri 'https://workflowhost:23302' -AllowOAuthHttp -Force
'https://workflowhost:23302' is NOT central admin, its a url pointing to the workflow service, this url is found within iis manager under sites.
look at the image below under sites you can see the workflow site, right click and then browse
follow this trouble shooting guide for workflow service!
http://msdn.microsoft.com/en-us/library/windowsazure/jj193529(v=azure.10).aspx
EDIT
ok looks like were getting somewhere! ;)
looks like the workflow manager hasnt been installed properly! as you should see the site and the service within the app pool under iis manager!
you need to follow this guide http://technet.microsoft.com/en-us/library/jj193478 go through each stage carefully!
**
If you belive that the setup is fine than skip part 1 and goto part 2 instead to make sure you have setup the wrokflow farm correctly!
**
the stages are:
1) install
http://technet.microsoft.com/en-us/library/jj193525
2) Open the Start menu.
In All Programs, go to Workflow Manager 1.0. Click the Workflow Configuration shortcut to start Workflow Configuration Wizard.
now create the farm (workflow farm ;) ):
http://technet.microsoft.com/en-us/library/jj193514
3) verify workflow config!
1.Go to Start. Right click Computer and click Manage.
2.Expand configuration.
3.Click the Services.
4.Ensure that the entry in the Status column reads Started for the workflow services.
If this service is not yet started, right-click the service name in the Name column and click Start.
4) now carry on with the url i posted earlier to get it working with sharepoint!
http://technet.microsoft.com/en-us/library/jj658588
as per your example it would be:
Register-SPWorkflowService -SPSite 'https://sharepoint.example.com' -WorkflowHostUri 'https://workflowhost:23302' -AllowOAuthHttp -Force
Even I faced the same issue previously. though workflow manager and all other stuffs were configured properly I was not able to see SP2013 Workflows in sharepoint designer as well as in other list and libraries.
Solution : whenever a new workflow service application proxy is created in SP2013, by default it will not be associated(service connection) with any web application. Go to Central admin site->Manage web applications page -> Select the web app which was registered earlier during configuration and check " workflow service application proxy" and click OK