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Multi-factor Authentication and Recent T-Mobile Changes

Posted Date: 19 Dec 2017

Effective Date: 19 Dec 2017

Northwestern IT has learned that wireless carrier T-Mobile has implemented “automatic scam protection” for its customers that may block phone call notifications from Duo Multi-factor Authentication (MFA) at Northwestern.

The feature, which notifies users when a call comes from an automated dialer, is being activated by default for all T-Mobile customers.

As a result of this change, T-Mobile users who have elected to receive a phone call to confirm their identity will see a “Scam Likely” notification on their Caller ID for the Duo MFA confirmation call. If they choose to activate an additional feature, called Scam Block, they won’t receive the Duo MFA call at all.

With the likelihood that other mobile carriers will implement similar features in the near future, please consider the following when using MFA at Northwestern:

Northwestern IT has requested T-Mobile whitelist the numbers we use for Duo, and is investigating other potential solutions.

T-Mobile includes more information about these features on its website:

For technical assistance with Duo Multi-factor Authentication, please contact the IT Support Center.

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