Fastmail and 1P integration broken

Question

1Password for Mac 8.12.441Password for Safari 8.12.44.33Safari Version 27.2MacOS 27.2I have Fastmail and 1P integrated (per screenshots), however I have no option to use a masked email when filling in any email field in any form.I have revoked access in Fastmail and 1P and then relinked them many times (this seems to be the main fix suggested in other similar threads), but to no avail. What else can I check or do to get this working?Thanks.

1P_Dave · Accepted Answer

Hello ​@ChrisE! 👋I’m sorry that 1Password’s masked email alias feature isn’t working in Safari. I suspect that you have macOS AutoFill support enabled, which will suppress 1Password for Safari’s filling features including masked email alias generation. Try these steps to turn off macOS AutoFill:Click on the Apple logo in the top left corner of your screen in the menu bar, then click System Settings.Click General, then click AutoFill & Passwords.Turn off “AutoFill Passwords and Passkeys”.Then, in Safari follow these steps to turn off the built-in password manager:Turn off the built-in password manager in your browserThat said, I’m now seeing theseerrors in the Extension pane in Safari. Does that help diagnose this?Those errors shouldn’t be related, they’re surfaced in macOS 27 and our developers are looking into themseparately.After turning off macOS AutoFill, restart both Safari and 1Password. Then try to fill your masked email alias again. Let me know if it works now.-Dave

jamesH45User4534 · Answer

Make sure the Fastmail integration is actually enabled in 1Password’s Preferences → Accounts → Fastmail (and that your account is set as the default). Also double‑check the Safari extension options – the “Use 1Password for autofill” toggle must be on. If it still won’t show masked emails, try clearing Safari’s cache or restarting the browser after you re‑link the accounts.

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