Reasons for seeing the "VertiGIS Studio Workflow must be licensed for use in production applications." dialog in Workflow or Reporting

For both the on-premises and SaaS versions of workflow, this dialog may appear for the following reasons:

Reason: Your subscription or maintenance has lapsed. 
Solution: Contact customerservice-ca@vertigis.com or your account manager to check what subscription you currently have, or to explore options.

Reason:  You are running workflows from an environment your organization is not licensed for.  Different licensing applies to on-premises vs SaaS Workflow, and to running workflows in VertiGIS Studio and Geocortex apps vs in Esri's Web AppBuilder or Experience Builder.  Your organization might be licensed for only some, or for all of the above.
Solution: Contact customerservice-ca@vertigis.com or your account manager to check what subscription you currently have, or to explore options.

If the workflow was created from an on-premises version of Workflow Designer installed on your server, rather than from the SaaS designer at https://apps.vertigisstudio.com/workflow/designer, then the following reasons may also apply:

Reason: VertiGIS Studio Workflow was previously activated offline, and the "valid until" date from that activation has expired.
Solution: Run the VertiGIS Studio Workflow post installer on the server where workflow is installed, and check the status on the Licensing page.  If the post installer reports that Workflow is not licensed, then contact customerservice-ca@vertigis.com or the VertiGIS Studio reseller in your country to request the updated key code, or try performing an online activation instead. 

Reason: An older version of VertiGIS Studio Workflow is installed, and that version is affected by a licensing bug. In particular, version 5.13 has a fix for a license issue caused by using one of the offline activation key methods available in the post installer.  Version 5.11.1 has a fix for an issue that prevented previously-elapsed licenses from being correctly renewed through the post installer.
Solution: Update VertiGIS Studio Workflow to the latest version. Refer to this article for links to the current download site.

Reason: If only certain users or certain devices encounter the licensing message, then it's possible their device isn't able to make requests to the server where Workflow is installed.  When running workflows from an app or viewer, a request is sent back to the workflow server to check the license.  If that request can't be made because the workflow server is in a dev or internal-only environment, then some users may receive the licensing warning when running workflows.
Solution: Confirm your VertiGIS Studio Workflow server is accessible to the end-users running the workflow.  A good test is to check if their device can reach your Workflow Designer URL.  If they cannot reach this URL and they are not within your internal network, consider installing VertiGIS Studio Workflow on an externally accessible server, or working with your IT team to make your existing workflow server externally accessible.

• Note- If you change your Workflow installation to a new server, then you must re-open and re-save your workflows from the new Workflow Designer to update their license information.

Reason: The workflow "service" application was not able to start correctly.  This can happen for a number of configuration-related reasons, including permission errors for the workflow "data directory" folder or problems with the optional "databasesettings.json" or "emailsettings.json" configuration files in the data directory.  
Solution: To test if this is the issue, visit your workflow service's "ping" page in a browser by replacing the "/Designer" part of your regular workflow designer URL with "/Service/ping", Eg. https://[myworkflowserver.mydomain.com]/VertigisStudio/Workflow/Service/ping.  If the page reports the workflow's app name and version number, then the "service" application is running correctly. If the page does not load or presents errors, any recent changes to the data directory or its optional configuration files should be investigated.  If no changes have been made recently or for assistance with the investigation, contact support using the links below. Include the error from the ping URL.

If these steps do not resolve the issue, please submit a ticket or contact the VertiGIS Studio reseller in your country and we will investigate further.