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Gmail login not possible, passkey prompt in Thunderbird built in browser not working

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When trying to authenticate a gmail account that has a passkey 2fa setup the built in browser popup does not allow a passkey prompt, nothing shows up.

When trying to authenticate a gmail account that has a passkey 2fa setup the built in browser popup does not allow a passkey prompt, nothing shows up.

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Passkeys are not available in Thunderbird with Gmail is my understanding. The browser part of the process is served by google, not Thunderbird. They decide what the page contains.