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Office 365 authentication with a FIDO2 USB stick in Thunderbird

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Hello

Our company uses Office 365 with two-factor authentication. Previously, this worked perfectly with Thunderbird (with IMAP) and TOTP. Now, our IT department has removed this option, as well as authentication via SMS or phone call. The only way to bypass the MS Authenticator app is now with a FIDO2 USB stick. This works perfectly with Firefox, but not with Thunderbird.

When logging in, if I understand correctly, Thunderbird opens its own browser, which doesn't support FIDO2. Is this correct, or is there a workaround I haven't found? And if it is, is there a way to configure Thunderbird to use Firefox (which does support FIDO2) as the browser for logging into Office 365 instead of its own browser? And if that doesn't work either, are there any other ideas? (I use Thunderbird 128.13.0 esr with Debian 12)

I appreciate any feedback that helps me move forward... or, if it doesn't work at all, destroys any hope.

Best regards

Hello Our company uses Office 365 with two-factor authentication. Previously, this worked perfectly with Thunderbird (with IMAP) and TOTP. Now, our IT department has removed this option, as well as authentication via SMS or phone call. The only way to bypass the MS Authenticator app is now with a FIDO2 USB stick. This works perfectly with Firefox, but not with Thunderbird. When logging in, if I understand correctly, Thunderbird opens its own browser, which doesn't support FIDO2. Is this correct, or is there a workaround I haven't found? And if it is, is there a way to configure Thunderbird to use Firefox (which does support FIDO2) as the browser for logging into Office 365 instead of its own browser? And if that doesn't work either, are there any other ideas? (I use Thunderbird 128.13.0 esr with Debian 12) I appreciate any feedback that helps me move forward... or, if it doesn't work at all, destroys any hope. Best regards

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