[wp-trac] [WordPress Trac] #54290: Domain mapping: Text displayed on wp-signup.php asserts site doesn't exist when it does actually exist

[WordPress Trac]

#54290: Domain mapping: Text displayed on wp-signup.php asserts site doesn't exist
when it does actually exist
--------------------------------+-----------------------------
 Reporter:  henry.wright        |      Owner:  (none)
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:
 Severity:  normal              |   Keywords:
  Focuses:  multisite           |
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 In a network install, when domain mapping is active for a custom domain,
 the following message appears on the wp-signup.php page when the network
 sub-domain is visited:

 > The site you were looking for, https://foo.example.com/, does not exist,
 but you can create it now!

 **Steps to reproduce**

 1. Map a network site "foo.example.com" to a custom domain "foo.com" using
 this guide: https://wordpress.org/support/article/wordpress-multisite-
 domain-mapping/
 2. Visit the network sub-domain "foo.example.com" in a browser
 3. Observe the text on wp-signup.php which notes "foo.example.com" doesn't
 exist

 The network sub-domain "foo.example.com" does exist so this text shouldn't
 be displayed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54290>
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