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The message: “One of your on-premises Federation Service certificates is expiring…” is presented when you log into the Office 365 portal at https://portal.office.com

Problem You’ve recently noticed that you receive the following message when logging into the Office 365 portal at https://portal.office.com: One of your on-premises Federation Service certificates is expiring. Failure to renew the certificate and update trust properties within 27 days will result in a loss

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