Did older versions of your app require IE? If so, their admins may have added your site to Enterprise Mode[0] so that it opens with IE. https://docs.microsoft.

Did older versions of your app require IE? If so, their admins may have added your site to Enterprise Mode[0] so that it opens with IE. https://docs.microsoft.com/en-us/microsoft-edge/deploy/emie-to-improve-compatibility https://docs.microsoft.com/en-us/microsoft-edge/deploy/emie-...