Custom Login screen - Yammer app webpart not working

Hi Team,
I have created windows login website and configured Yammer . it is working fine.
But I have created another website with custom login screen and If i check Yammer Feed app webpart nothing is opening.for few browsers got exception like "401 : unauthorized access".
I have placed custom log in page in "_layouts" folder.
I am new to sharepoint 2013 and Yammer. kindly let me know in details what is the problem and root cause and solution.
Otjherwise is there any chance to create a custom webpart using Yammer API ? If so where I can find it ? what are the root Dll's and root classes to implement it.
Regards,
Rajesh

Hi,
According to your description, my understanding is that when you access the Yammer Feed app, it occur "401:unauthorized access" .
If this error occurs in few browsers, it could be related to browser settings. The Yammer Feed app requires the user has third party cookies enabled in their browsers.
Here are some similar threads about the solution for this issue:
http://stackoverflow.com/questions/23248749/yammer-embed-feed-works-in-ie-and-firefox-but-not-in-chrome-gives-401-unauthori
http://stackoverflow.com/questions/27383175/http-401-error-for-every-yammer-rest-api-call-for-a-given-network
About how to use Yammer API to create custom web part, here are some detailed articles for your reference:
https://samlman.wordpress.com/2015/03/02/using-the-yammer-api-in-a-net-client-application/
http://pythonhosted.org/yampy/api.html
https://github.com/yammer/yam
Thanks
Best Regards
Jerry Guo
TechNet Community Support

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