Push Notification - Bad request - SP12

Hi Experts,

When I'm trying to Push the notification from back-end system to SMP version SP12 with HTTP Post method, getting the response as 400 - Bad Request.

But, the same method is working for earlier versions of SMP.

Scenario:

Endpoint URIs generated as follows:

SMP SP12 - http://*****************:****/restnotification/registration/424a5110-be09-404a-bbb2-fbe80207455f

SMP SP08 - http://*****************:****/Notification/ad0d15fd-00b8-4b20-ab31-48ab310fe350

Please give your suggestions.

Thanks & Regards,

Sandeep KS