Tableau Bridge is required to setup scheduled refreshes for Tableau Connector Pro for Jira inside Tableau Online
Please refer to the link and the video below for more details
Use Tableau Bridge to Keep Tableau Online Data Fresh
Download and install Tableau Bridge from this link: Tableau Bridge
After the installation is complete, Sign in to Tableau Online account from Tableau Bridge
Tableau Bridge client icon will appear in Windows System Tray
Publish the Tableau workbook to Tableau Online
Make sure the Connection type for the Data Source is set to Extract
In Tableau Desktop, go to Server > Publish Workbook
Click “Tableau Online”
Login to your Tableau Online account
Click Edit next to Data Sources
Select, Publish type: Published separately, Authentication: Embedded Password
Publish the workbook
Login to Tableau Online
Navigate to the published Data Source extract
Go to Extract Refreshes
Click Refresh this extract on Tableau Online
Select the Computer on which Tableau Bridge is installed and click Save
Go Back to the computer with Tableau Bridge Client. You should see the Data Source listed there now
Click on the Data Source Name, leave the username and password blank and click Save
Click on the Data Source name again and click Schedule, Tableau Online site will launch, form where refreshes can be scheduled