Transient failure in /qa/specs/features/ee/browser_ui/1_manage/group/group_saml_sso_spec.rb - Shows 404 Page Not Found

Found in scheduled master run. Different failure but the same test as #37308 (closed).

Failing job: https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/376016125

8017 Failures:
8018   1) Manage Group SAML SSO Enforced SSO Group managed accounts removes existing users from the group, forces existing users to create a new account and allows to leave group
8019      Failure/Error: expect(page).to have_text("Sign up was successful! Please confirm your email to sign in.")
8020        expected to find text "Sign up was successful! Please confirm your email to sign in." in "Page Not Found Make sure the address is correct and the page hasn't moved. Please contact your GitLab administrator if you think this is a mistake. Search Home Sign out and sign in with a different account Help"
8021      # ./qa/specs/features/ee/browser_ui/1_manage/group/group_saml_sso_spec.rb:208:in `block (5 levels) in <module:QA>'

Pretty obvious why it couldn't find the text, but why did it 404?

/cc @sliaquat