diff --git a/app/models/form/admin_settings.rb b/app/models/form/admin_settings.rb
index 6ab5b0bdd5f11b..d4ce2a8e7f71af 100644
--- a/app/models/form/admin_settings.rb
+++ b/app/models/form/admin_settings.rb
@@ -131,8 +131,7 @@ class Form::AdminSettings
   attr_accessor(*KEYS)
 
   validates :registrations_mode, inclusion: { in: %w(open approved none) }, if: -> { defined?(@registrations_mode) }
-  validates :site_contact_email, :site_contact_username, presence: true, if: -> { defined?(@site_contact_username) || defined?(@site_contact_email) }
-  validates :site_contact_username, existing_username: true, if: -> { defined?(@site_contact_username) }
+  validates :site_contact_username, presence: true, existing_username: true, if: -> { defined?(@site_contact_username) }
   validates :bootstrap_timeline_accounts, existing_username: { multiple: true }, if: -> { defined?(@bootstrap_timeline_accounts) }
   validates :show_domain_blocks, inclusion: { in: %w(disabled users all) }, if: -> { defined?(@show_domain_blocks) }
   validates :show_domain_blocks_rationale, inclusion: { in: %w(disabled users all) }, if: -> { defined?(@show_domain_blocks_rationale) }