diff --git a/app/views/digest_mailer/work_packages.html.erb b/app/views/digest_mailer/work_packages.html.erb
index 802f6f887ac4..32965e9394de 100644
--- a/app/views/digest_mailer/work_packages.html.erb
+++ b/app/views/digest_mailer/work_packages.html.erb
@@ -60,7 +60,7 @@
                 <table <%= placeholder_table_styles %>>
                   <tr>
                     <td style="background: #D1E5F5; padding: 8px 12px; border: 1px solid #1A67A3; border-radius: 16px; overflow: hidden; text-overflow: ellipsis;">
-                      <a href="<%= notifications_path %>"
+                      <a href="<%= notifications_url %>"
                          target="_blank"
                          style="color: #1A67A3; text-decoration: none; font-size: 14px;white-space: nowrap;">
                         <%= I18n.t(:'mail.work_packages.see_all') %>
diff --git a/app/workers/mails/reminder_job.rb b/app/workers/mails/reminder_job.rb
index 01e84db4ea28..bbc6eaba109e 100644
--- a/app/workers/mails/reminder_job.rb
+++ b/app/workers/mails/reminder_job.rb
@@ -32,7 +32,11 @@ class Mails::ReminderJob < Mails::DeliverJob
 
   good_job_control_concurrency_with(
     total_limit: 1,
-    key: -> { "#{self.class.name}-#{arguments.last}" }
+    key: -> do
+      id = arguments.last.respond_to?(:id) ? arguments.last.id : arguments.last
+
+      "#{self.class.name}-#{id}"
+    end
   )
 
   private
diff --git a/spec/mailers/digest_mailer_spec.rb b/spec/mailers/digest_mailer_spec.rb
index 6b6b4d9fba2d..4dabc26717c4 100644
--- a/spec/mailers/digest_mailer_spec.rb
+++ b/spec/mailers/digest_mailer_spec.rb
@@ -120,6 +120,16 @@
         .to have_text(expected_text, normalize_ws: true)
     end
 
+    it "includes a reference to the notification center if there are more than the maximum number of shown work packages" do
+      stub_const("DigestMailer::MAX_SHOWN_WORK_PACKAGES", 0)
+
+      expect(mail_body)
+        .to have_text I18n.t(:"mail.work_packages.more_to_see.one")
+
+      expect(mail_body)
+        .to have_link(I18n.t(:"mail.work_packages.see_all"), href: notifications_url)
+    end
+
     context "with only a deleted work package for the digest" do
       let(:work_package) { nil }