Teams preview won't open in Safari
Safari 11.0 uses Intelligent Tracking Prevention to block third-party tracking cookies. Because of the way Intelligent Tracking Prevention categorizes cookies, login.microsoftonline.com gets lumped into this category (even though login.microsoftonline.com is not a tracking domain), and Microsoft Teams is prevented from opening.
If you want to use Teams in Safari while Safari browser support is in preview, go to Preferences > Privacy and uncheck the Prevent cross-site tracking setting. Then, close your browser and navigate back to teams.microsoft.com in Safari.
Notes:
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Changing this setting may impact your experience on other websites.
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Once Safari is fully supported for Teams, you will no longer need this workaround.
When you're done using Teams in Safari, go to Preferences > Privacy and check the Prevent cross-site tracking setting again.
Read more about Intelligent Tracking Prevention here.
