diff --git a/app/lib/activitypub/tag_manager.rb b/app/lib/activitypub/tag_manager.rb
index f9066b3b12f5a5..fbf595df85b314 100644
--- a/app/lib/activitypub/tag_manager.rb
+++ b/app/lib/activitypub/tag_manager.rb
@@ -59,7 +59,7 @@ def uri_for(target, group: false)
 
   def approval_uri_for(quote, check_approval: true)
     unless quote.quoted_account&.local?
-      return 'http://kmy.blue/ns#LegacyQuote' if Setting.auto_accept_legacy_quotes && !quote.approval_uri && quote.quoted_account&.domain && InstanceInfo.legacy_quote_software?(quote.quoted_account.domain)
+      return 'http://kmy.blue/ns#LegacyQuote' if Setting.auto_accept_legacy_quotes && quote.approval_uri.nil? && InstanceInfo.legacy_quote_software?(quote.quoted_account.domain)
 
       return quote.approval_uri
     end
diff --git a/app/models/quote.rb b/app/models/quote.rb
index 7b860820a5516f..dcfcd3b353cf6e 100644
--- a/app/models/quote.rb
+++ b/app/models/quote.rb
@@ -44,12 +44,6 @@ class Quote < ApplicationRecord
   after_destroy_commit :decrement_counter_caches!
   after_update_commit :update_counter_caches!
 
-  def legacy_accepted?
-    return false if !accepted? || !quoted_account || quoted_account.local?
-
-    InstanceInfo.legacy_quote_software?(quoted_account.domain)
-  end
-
   def accept!
     update!(state: :accepted)
   end
diff --git a/app/serializers/activitypub/note_serializer.rb b/app/serializers/activitypub/note_serializer.rb
index c2ead2118109eb..5f2589050e4f53 100644
--- a/app/serializers/activitypub/note_serializer.rb
+++ b/app/serializers/activitypub/note_serializer.rb
@@ -279,7 +279,7 @@ def quote?
   end
 
   def quote_authorization?
-    object.quote.present? && (Setting.auto_accept_legacy_quotes ? object.quote.legacy_accepted? : ActivityPub::TagManager.instance.approval_uri_for(object.quote).present?)
+    object.quote.present? && ActivityPub::TagManager.instance.approval_uri_for(object.quote).present?
   end
 
   def quote
diff --git a/spec/serializers/activitypub/note_serializer_spec.rb b/spec/serializers/activitypub/note_serializer_spec.rb
index 091eb9cdfc6979..01ab5367029dd7 100644
--- a/spec/serializers/activitypub/note_serializer_spec.rb
+++ b/spec/serializers/activitypub/note_serializer_spec.rb
@@ -113,6 +113,82 @@ def reply_items
     end
   end
 
+  context 'with a pending quote' do
+    let(:quoted_account) { Fabricate(:account) }
+    let(:quoted_status) { Fabricate(:status, account: quoted_account) }
+    let!(:quote) { Fabricate(:quote, status: parent, quoted_status: quoted_status, state: :accepted) }
+
+    shared_examples 'quote is authorized' do
+      it 'has the expected shape' do
+        expect(subject).to include({
+          'type' => 'Note',
+          'quote' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+          'quoteUri' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+          '_misskey_quote' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+          'quoteAuthorization' => ActivityPub::TagManager.instance.approval_uri_for(quote),
+        })
+      end
+    end
+
+    shared_examples 'quote is not authorized' do
+      it 'has the expected shape' do
+        expect(subject).to include({
+          'type' => 'Note',
+          'quote' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+          'quoteUri' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+          '_misskey_quote' => ActivityPub::TagManager.instance.uri_for(quote.quoted_status),
+        })
+        expect(subject).to_not have_key('quoteAuthorization')
+      end
+    end
+
+    it_behaves_like 'quote is authorized'
+
+    context 'when quote is pending' do
+      let(:quote) { Fabricate(:quote, status: parent, quoted_status: quoted_status, state: :pending) }
+
+      it_behaves_like 'quote is not authorized'
+    end
+
+    context 'when quote is from misskey and approval_uri is nil' do
+      let(:quoted_account) { Fabricate(:account, uri: 'https://example.com/actor', domain: 'example.com') }
+
+      before { Fabricate(:instance_info, domain: 'example.com', software: 'misskey') }
+
+      it_behaves_like 'quote is not authorized'
+    end
+
+    context 'when quote is from misskey and approval_uri is nil, auto_accept_legacy_quotes is enabled' do
+      let(:quoted_account) { Fabricate(:account, uri: 'https://example.com/actor', domain: 'example.com') }
+
+      before do
+        Fabricate(:instance_info, domain: 'example.com', software: 'misskey')
+        Setting.auto_accept_legacy_quotes = true
+      end
+
+      it_behaves_like 'quote is authorized'
+    end
+
+    context 'when quote is from mastodon and approval_uri is nil' do
+      let(:quoted_account) { Fabricate(:account, uri: 'https://example.com/actor', domain: 'example.com') }
+
+      before { Fabricate(:instance_info, domain: 'example.com', software: 'mastodon') }
+
+      it_behaves_like 'quote is not authorized'
+    end
+
+    context 'when quote is from mastodon and approval_uri is nil, auto_accept_legacy_quotes is enabled' do
+      let(:quoted_account) { Fabricate(:account, uri: 'https://example.com/actor', domain: 'example.com') }
+
+      before do
+        Fabricate(:instance_info, domain: 'example.com', software: 'mastodon')
+        Setting.auto_accept_legacy_quotes = true
+      end
+
+      it_behaves_like 'quote is not authorized'
+    end
+  end
+
   context 'with a quote policy', feature: :outgoing_quotes do
     let(:parent) { Fabricate(:status, quote_approval_policy: Status::QUOTE_APPROVAL_POLICY_FLAGS[:followers] << 16) }