To change your phone number once you have been migrated, follow these steps:
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- Sign into Office 365 at https://office.com.
- In the upper right corner, click your profile picture and select My Account.
- On the left hand side bar select Security Info. At this point it may send you a validation text message. Then on the next page select Change.
- Alternatively, you can go to https://mysignins.microsoft.com/security-info to update your number as well.
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