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Magic Flow not working for aliased @automattic.com email addresses #103521

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@dmallory42

Description

@dmallory42

Context and steps to reproduce

As noted in #103479, an error occurs when trying to use the Magic Link flow with an aliased @automattic.com email address.

Reproduction steps:

  • Go to any flow which requires Jetpack authentication (the easiest one I can think of is to go to jurassic.ninja and log out of your WP account, then click Login).
  • On the login screen (see screenshot below), enter an email that isn't already associated with an account (you can use your.email+somerandomstring@automattic.com)
    Screenshot 2025-05-16 at 12 44 58
  • When prompted, click create a new account.
  • Enter the email address again and click continue.
  • It will fail with the following error:

Screenshot 2025-05-16 at 12 45 52

Anecdotally, I tested this flow in the past when working on updates to the magic flow (e.g. #95617), so there has been a regression at some point.

Site owner impact

Fewer than 20% of the total website/platform users

Severity

Minor

What other impact(s) does this issue have?

No revenue impact

If a workaround is available, please outline it here.

No response

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    3. Scrubbed / ReadyTriage > 3. Scrubbed / Ready[Feature Group] Signup & Site OnboardingTools for user registration and onboarding new users to the site.[Product] WordPress.comAll features accessible on and related to WordPress.com.[Type] BugWhen a feature is broken and / or not performing as intended

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