Joomdle Shop - Publish/ Unpublish not working

Course created on Moodle appears in Joomdle Shop. However, they are not published to Hikashop Category. When I try to publish or unpublish the course from Joomdle Shop the status remains unchanged.
Joomdle - Sell on Shop not working

prntscr.com/kymufy

System Check - is all green
Using Joomdle 1.2.1

Hi.

What Hikashop version are you using? I just tested with current one, and it is working fine. Also, no other users have reported similar problems, so I don't know what the issue can be...

That's scary ...
For my production site I am using Hikashop 2.3.0 & Joomdle 1.1.4
On my development site I upgraded to Hikashop 3.5.1 & Joomdle 1.2.1

I have shared my development site access to your email id. If you can login and check the issue

For reference: this was caused by outdated Joomla version.