WhatsApp restoring "No Backup found" Error

Hi,

I have had a problem with my whatsapp and I am trying to recover my chat history from

iCloud. I backed up my iPhone on iCloud two weeks ago.

Now when I signed back into iCloud and installed Whatsapp again and gave my same old number, Restore from iCloud saying "No

Backup found".

But I can see the Whatsapp backup of 2GB in Settings>

iCloud> Manage Storage> Backups. It has messages from more than 2 years that I'm saving it.

I have enough storage space to restore

and I tried with connecting to the different Wi-Fi .

My current iOS version is 11.1.2.

Any help or suggestion to get back my backup would be highly appreciated. what should I do now?

Thanks