Reproduce:
1 Create an account on binaryfortress.com
2. Enable 2FA TOTP on site.
3. Copy CODE TOTP to new entry in Bitwarden Extension
4. Copy generated TOTP for verify.
5. Code will fail verification.
I confirm that this is an issue for me as well. If I use the secret key to setup TOTP within Bitwarden, it fails. However, if I scan the QR code then it works fine.