Answer by m1g for SharePoint is Redirecting to Yammer because of yammer feed...
Had the same exact issue. It appears that it may have been due to some kind of authentication mix-up. I was logged into my company network prior to signing in, but logged in as a user on another tenant...
View ArticleSharePoint is Redirecting to Yammer because of yammer feed embed
I've embedded a yammer feed using the "embed this feed in Your Site" into my team SharePoint. When I'm already logged into yammer and navigate to my team SharePoint I am redirected to my yammer feed...
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