Add a button on Incident Related List in service operation workspace

[Ssinha4]

Hi,

I have to create a Add button for cases related list on incident record in SoW. I followed few of the articles from community.

https://www.servicenow.com/community/next-experience-articles/introduction-to-declarative-actions/ta...

https://www.servicenow.com/community/next-experience-forum/how-to-add-records-in-a-related-list-with...

'Add Case' Button gets added but onclick is not working. the model window is not opening. Please find my steps below and let me know if i am missing something.

1. Created a related list action assignment.

2. Create Action payload

3. Create UX Add-on Event Mapping in Action Assignment

Based on below article i have also created a UX App Route for this one.

https://www.servicenow.com/community/next-experience-forum/how-to-add-records-in-a-related-list-with...

Version - Yokohama/Zurich

Cleared the cache too. But model is not working.

Kindly help,

Thanks in advance