This question is in reference to Atlassian Documentation: Two-step verification
I have a suitable Yubikey for U2F authentication which I use already with Google Docs and GitHub, but I don't have a suitable mobile device as a needed prerequisite for Bitbucket 2FA. Is this a hard requirement? If so, have you considered allowing U2F authentication separately from authentication with a mobile device?
Yes, you can with 1Password and Authy: https://confluence.atlassian.com/bitbucket/two-step-verification-777023203.html
I have it without any smartphone. You can use a password manager such as 1Password, or Authy (check https://confluence.atlassian.com/bitbucket/two-step-verification-777023203.html).
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