Hello Siva,
I can reproduce it with all possible models.
Yes, my mappings are saved. I can re-open and edit and everything is still there.
So it does not seem to be that problem.
You can see screen casting here: https://sharing.codeagency.be/04202m173Y2G
I am testing on a fresh install. It’s just a demo environment I use to test plugins.
I also tried on a brand new setup on Cloudways, same issue.
I tried different models like CRM, contacts, leads, … and lastly I tried tickets from Helpdesk app.
The helpdesk API is activated so it should work fine, but nothing happens when you submit the contact form.
Either something is wrong with your plugin as other people also report the same problem, so it’s very likely something is wrong.
Or there is something specific with Odoo running on Odoo.SH hosting platform
https://odoo.sh (only official Odoo partners)