When I am trying to follow a dashboard in chatter, I'm not able to find any Follow icon.
Is there any alternate way to follow a dashboard, Or how can I find the Follow + icon in the Feed.

Thank you. 

I don't know where contact support, so I will post this here.
The Challenge for Reports & Dashboards : Sharing and Notifications was unable to complete.

The Error message:
There was an unhandled exception. Please reference ID: SUILXNRM. Error: Faraday::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist