Two-Factor Auth Setup will not accept numerical codes from newly created Authy 'Firefox Account'
I got a new phone and went to reset my 2FA, scan a new QR, and go about my day.
I successfully removed the old 2FA setup from Authy on my older phone, and from my Mozilla account. I can access my user account settings for my Mozilla account and select to add a new 2FA method.
I land on the page which displays a QR code, which I can scan with Authy, and which immediately shows my account information as confirmation.
However, once I try to enter the first numerical code displayed -- Mozilla's text field declines on "incorrect code". I have done this over several times, tried on both phones, and waited for further numerical codes to be generated from the app. No success.
Right now I am on default email based 2FA and cannot for the life of me get the QR or manual onboarding process to accept a code from my app. I have to return my old phone soon so I was hoping to get some advice and figure this out just in case the issue was due to something there.
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Make sure that you have the correct (same) time on all devices because the 6 digit TOTP code is only valid for 30 seconds. You can try to scan the QR code with your barcode scanner and pass the otpauth:// URL to Authy.
You can also try to install other authenticator apps like Google Authenticator temporarily and compare the generated codes to see whether they work.