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If you are getting multiple requests throughout the day to approve your sign-ins via phone call, SMS text, or authenticator app, a setting in your browser might be causing this. The setting to clear cookies and site data when browser closed needs to be reverted back to the default value, which is Disabled. Please see below on how to change this on various browsers.
GOOGLE CHROME
Go to Settings > Privacy and security > Site settings > Additional content settings > On-device site data
MICROSOFT EDGE
Go to Settings > Privacy, search, and services > Choose what to clear every time you close the browser > Cookies and other site data
MOZILLA FIREFOX
Go to Settings > Privacy & Security > Delete cookies and site data when Firefox is closed
Remember history also needs to be set
