default the project to target.project

app/models/notification_recipient.rb

 class NotificationRecipient
   attr_reader :user, :project, :type
-  def initialize(user, project, type,
-                 custom_action: nil, target: nil, acting_user: nil, read_ability: nil)
-    @project = project
+  def initialize(user, type,
+                 custom_action: nil,
+                 target: nil,
+                 acting_user: nil,
+                 read_ability: nil,
+                 project: nil)
     @custom_action = custom_action
     @acting_user = acting_user
     @read_ability = read_ability
     @target = target
+    @project = project || @target&.project
     @user = user
     @type = type
+
+    raise ArgumentError, "Project is missing" if @project.nil?
   end
 
   def notification_setting

app/services/notification_recipient_service.rb

@@ -56,7 +56,8 @@ module NotificationRecipientService
       end
 
       def make_recipient(user, type)
-        NotificationRecipient.new(user, project, type,
+        NotificationRecipient.new(user, type,
+          project: project,
           custom_action: custom_action,
           target: target,
           acting_user: acting_user,

app/services/notification_service.rb

@@ -272,7 +272,7 @@ class NotificationService
   end
 
   def project_was_moved(project, old_path_with_namespace)
-    recipients = NotificationRecipientService.notifiable_users(project.team.members, project, :mention)
+    recipients = NotificationRecipientService.notifiable_users(project.team.members, :mention, project: project)
 
     recipients.each do |recipient|
       mailer.project_was_moved_email(
@@ -307,7 +307,7 @@ class NotificationService
     return unless mailer.respond_to?(email_template)
 
     recipients ||= NotificationRecipientService.notifiable_users(
-      [pipeline.user], pipeline.project, :watch,
+      [pipeline.user], :watch,
       custom_action: :"#{pipeline.status}_pipeline",
       read_ability: :read_build,
       target: pipeline