Could you give us a bit more information such as:
1. On which devices does the issue occur?
2. Does the issue occur within the application or within the browser?
3. Is the view embedded in any other site?
The Issue was there in all mobile devices (Android, iOS &Windows).
When we checked with the team who were maintaining both Tableau and BI server, the issue was because of the BI server not exposed to Internet where as the Tableau Server was exposed to internet.
Hence the Dashboards were loading in Desktop browsers but not in mobile browsers, since in mobile the users were trying to access these browsers without the intranet connectivity.
Thanks & Regards,