To fix a stuck Office 365 login loop, you'll need to clear all browser caches associated with Office 365. Below you'll find the following instructions for Chrome, Firefox, and Internet Explorer instructions.
Google Chrome:
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From the menu, select Settings.
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Scroll down to Show Advanced Settings.
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Click on Content Settings.
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Click All Cookies and Site Data.
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Search for Office365.com.
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Click Remove All Shown.
Firefox:
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Select Options from the Menu.
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Select Privacy in the left pane.
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Click Remove Individual Cookies.
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Search for Office365.com
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Click Remove All.
Internet Explorer:
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Select Internet Options from the Menu.
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Click Settings under the General tab.
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Click View Files.
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Search for and delete any cookies from Office365.com.
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Navigate to the Caches and Databases tab in the settings window.
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Select Office365.com and click Delete.
Additionally, you should make sure your clock is set to the correct time, as this is known to cause the redirect loop.
