I has problem with 2fa on browser extension. The code is different always wrong. It's annoying that i has to open the app my phone to get the correct code

Why code on my phone is different with browser extension? Both are synced. The problem is, the code different only happens to selected site. Some 2fa codes are correct

So is this bug on browser extension?

Setup: self-hosted Vaultwarden 1.37.4, Bitwarden Firefox extension 2026.10.0. Username generator → Forwarded email alias → Fastmail, with “Add website prefix” checked.

On sites that use www., alias generation fails with “Fastmail error: Name is reserved.” For example, https://www.lg.com/ triggers it.

From what I can see in the source, prefix() in integration-context.ts keeps the subdomain. So www.lg.com becomes www_lg, which goes to Fastmail as emailPrefix. Fastmail appears to reserve prefixes starting with www and rejects them. The prefix meets Fastmail’s documented character rules, so the main fix belongs on Fastmail’s side.

Still, Bitwarden could fix it for every forwarder by:
- dropping a leading www when it builds the prefix, and/or - retrying without a prefix when the forwarder rejects one.

Workaround: uncheck “Add website prefix” for these sites.

Has anyone else seen this? I couldn’t find an existing GitHub issue. If nobody has one, I’ll open one on bitwarden/clients.

I'm not asking for much, that the program does the bare bones stuff of working properly. But all too often I'm left in frustration when BW can't do basic functioning like literally autofilling a field when I click on it. Instead, I get this. Yea, I try reporting this stuff, but it seemingly goes into a void; the Paypal password autofill problem I sent in a month or two ago went nowhere and still broken.

I hate sounding like a broken record, but in the many years I had LastPass I never dealt with this. In the two or so years I've been using BW, stuff like this is just a semi regular occurrence. These aren't niche never visited sites, these are mainstream heavy regular use stuff. *sigh*

Intel MacOS Sequoia 15.x BW Chrome v2026.9.3 for what it's worth.