Adobe Sign cloud service not visible under "Cloud Services" section

Dear All - I am planning to integrate Adobe Sign with Adobe AEM forms.

I have AEM 6.5 version installed. Did SSL configuration already. But when I refer the following website:

https://docs.adobe.com/content/help/en/experience-manager-64/forms/adaptive-forms-advanced-authoring/adobe-sign-integration-adaptive-forms.html

I could only go up to step 3. For step 4, I need to select "Adobe Sign" cloud service but it is not visible. I see all the other cloud services like Legacy Cloud Service, Translation Cloud Service,  facebook, twitter, rcapatch etc but this one is missing. This should be OOTB right. 

Can anyone help me figure out what am I missing here?

Thanks in advance.

Regards,

Sunder S