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Thunderbird Mobile OAuth login

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My alumni email account is hosted on Microsoft 360. My email address is xxx@alumni.caltech.edu, but the actual login user name is xxx@alumni.caltech.onmicrosoft.com. When I try to log in with Thunderbird for Android the user name is automatically set to my email address rather than the username specified in the incoming server settings. This field cannot be changed and it prevents me from logging in. Please help, and thank you for all of your fine work.

-->BoB

My alumni email account is hosted on Microsoft 360. My email address is xxx@alumni.caltech.edu, but the actual login user name is xxx@alumni.caltech.onmicrosoft.com. When I try to log in with Thunderbird for Android the user name is automatically set to my email address rather than the username specified in the incoming server settings. This field cannot be changed and it prevents me from logging in. Please help, and thank you for all of your fine work. -->BoB

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