EP 7.3 to 7.4-Notifications not working

Hi Experts,

We have upgraded the Portal from 7.3 to 7.4, and moved all content to the portal 7.4,

but notifications are not working.

Object is not able to fetch the content from the KM. we have compared everything(iView Properties and KM settings).

but couldn't able to trace the issue.

Seeking suggestions .

Best Regards,

Tarun Dhuria