[wp-trac] [WordPress Trac] #34065: Upgrading from single site to multisite fails when the Network Admin Email doesn't match an existing user.

[WordPress Trac]

#34065: Upgrading from single site to multisite fails when the Network Admin Email
doesn't match an existing user.
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 Reporter:  jjeaton             |       Owner:
     Type:  defect (bug)        |      Status:  new
 Priority:  normal              |   Milestone:  4.4
Component:  Networks and Sites  |     Version:  trunk
 Severity:  normal              |  Resolution:
 Keywords:  needs-patch         |     Focuses:  administration, multisite
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Changes (by jeremyfelt):

 * keywords:  has-patch => needs-patch


Comment:

 Replying to [comment:3 jjeaton]:
 > While maybe there would be a case where one admin was upgrading the site
 to multisite and wanted another admin account to be the admin_email user,
 I'm not sure how common that would be.

 It turns out this is much more common than I thought. This email is often
 a catch-all box for notifications and acts as a way to separate the
 admin's email from that attached to emails that users get when
 registering.

 We came up with this during office hours yesterday as a good start:

 * Check for valid `$site_user` based on the entered email.
 * If not valid, assign the provided email to `admin_email`, but ensure the
 current user is set for everything else.
 * Update messaging on the initial screen to match. Related: #34293.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34065#comment:5>
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