diff --git a/spec/controllers/api/v1/accounts_controller_spec.rb b/spec/controllers/api/v1/accounts_controller_spec.rb
index ec49ecd39..d773cafa7 100644
--- a/spec/controllers/api/v1/accounts_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts_controller_spec.rb
@@ -81,6 +81,29 @@ RSpec.describe 'Accounts API', type: :request do
       end
     end
 
+    context 'when ENABLE_ACCOUNT_SIGNUP is stored as boolean false' do
+      before do
+        GlobalConfig.clear_cache
+        InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+        InstallationConfig.create!(name: 'ENABLE_ACCOUNT_SIGNUP', value: false, locked: false)
+      end
+
+      after do
+        InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+        GlobalConfig.clear_cache
+      end
+
+      it 'responds 404 on requests' do
+        params = { account_name: 'test', email: email, user_full_name: user_full_name, password: 'Password1!' }
+
+        post api_v1_accounts_url,
+             params: params,
+             as: :json
+
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
     context 'when ENABLE_ACCOUNT_SIGNUP env variable is set to api_only' do
       it 'does not respond 404 on requests' do
         params = { account_name: 'test', email: email, user_full_name: user_full_name, password: 'Password1!' }
diff --git a/spec/controllers/api/v2/accounts_controller_spec.rb b/spec/controllers/api/v2/accounts_controller_spec.rb
index 182ebadac..a39e37a91 100644
--- a/spec/controllers/api/v2/accounts_controller_spec.rb
+++ b/spec/controllers/api/v2/accounts_controller_spec.rb
@@ -94,6 +94,29 @@ RSpec.describe 'Accounts API', type: :request do
       end
     end
 
+    context 'when ENABLE_ACCOUNT_SIGNUP is stored as boolean false' do
+      before do
+        GlobalConfig.clear_cache
+        InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+        InstallationConfig.create!(name: 'ENABLE_ACCOUNT_SIGNUP', value: false, locked: false)
+      end
+
+      after do
+        InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+        GlobalConfig.clear_cache
+      end
+
+      it 'responds 404 on requests' do
+        params = { email: email, password: 'Password1!' }
+
+        post api_v2_accounts_url,
+             params: params,
+             as: :json
+
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
     context 'when ENABLE_ACCOUNT_SIGNUP env variable is set to api_only' do
       let(:account_builder) { double }
       let(:account) { create(:account) }
diff --git a/spec/controllers/devise/omniauth_callbacks_controller_spec.rb b/spec/controllers/devise/omniauth_callbacks_controller_spec.rb
index 1a775f88f..603458a01 100644
--- a/spec/controllers/devise/omniauth_callbacks_controller_spec.rb
+++ b/spec/controllers/devise/omniauth_callbacks_controller_spec.rb
@@ -106,6 +106,26 @@ RSpec.describe 'DeviseOverrides::OmniauthCallbacksController', type: :request do
       end
     end
 
+    it 'blocks signup if config is stored as boolean false' do
+      GlobalConfig.clear_cache
+      InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+      InstallationConfig.create!(name: 'ENABLE_ACCOUNT_SIGNUP', value: false, locked: false)
+
+      with_modified_env FRONTEND_URL: 'http://www.example.com' do
+        set_omniauth_config('does-not-exist-for-sure@example.com')
+        allow(email_validation_service).to receive(:perform).and_return(true)
+
+        get '/omniauth/google_oauth2/callback'
+
+        expect(response).to redirect_to('http://www.example.com/auth/google_oauth2/callback')
+        follow_redirect!
+        expect(response).to redirect_to(%r{/app/login\?error=no-account-found$})
+      end
+    ensure
+      InstallationConfig.where(name: 'ENABLE_ACCOUNT_SIGNUP').delete_all
+      GlobalConfig.clear_cache
+    end
+
     it 'allows login' do
       with_modified_env FRONTEND_URL: 'http://www.example.com' do
         create(:user, email: 'test@example.com')