Looking for logging into the Yammer Issues site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Yammer Issues site. After that you can login as usual with your login credentials.
https://answers.microsoft.com/en-us/msoffice/forum/all/login-issues-for-some-users-after-migration-in/0537b418-f9dd-496d-8596-8e18d1ea7fb0
https://support.office.com/en-us/article/-unexpected-login-failure-error-in-the-yammer-directory-synchronization-tool-8d3d8cf5-3050-4d59-9b94-8ee30f3a8bb9
https://support.office.com/en-us/article/sign-in-to-yammer-d863154a-4223-4ea2-8855-ccc971321b8e
https://support.office.com/en-ie/yammer
https://helpdesk.it.helsinki.fi/en/instructions/collaboration-and-publication/office-365/yammer
https://jamesosw.wordpress.com/2015/05/18/yammer-sso-trouble/
https://helpdesk.jamk.fi/en/yammer-sign-in-issue/
http://downdetector.com/status/yammer
https://stackoverflow.com/questions/50924129/yammer-login-to-web-app-not-working-on-iphone
https://www.softvative.com/blog/2014/12/yammer-feed-integration-with-sharepoint-online-common-issues/
https://twitter.com/yammersupport?lang=en
https://developer.yammer.com/docs/requirements
https://itunes.apple.com/ae/app/yammer/id289559439?mt=8