After updating Nintex Workflow 2016 to version 22.214.171.124, the document generation action might be missing in Workflow designer.
Navigate to Central Administration > Nintex Administration > External settings for Workflow
- Enable prerequisite service
- Activate Document Generation capability
Navigate back to the Nintex Administration page and click Action settings under Workflow environment
- Ensure Document Generation action is selected as part of the Core actions list and click OK.
- Reset IIS for the changes to be applied immediately.