diff --git a/lib/omniauth/strategies/microsoft_graph.rb b/lib/omniauth/strategies/microsoft_graph.rb
index 3cef1c4..665df28 100644
--- a/lib/omniauth/strategies/microsoft_graph.rb
+++ b/lib/omniauth/strategies/microsoft_graph.rb
@@ -6,6 +6,8 @@ class MicrosoftGraph < OmniAuth::Strategies::OAuth2
       BASE_SCOPE_URL = 'https://graph.microsoft.com/'
       BASE_SCOPES = %w[offline_access openid email profile].freeze
       DEFAULT_SCOPE = 'offline_access openid email profile User.Read'.freeze
+      YAMMER_PROFILE_URL = 'https://www.yammer.com/api/v1/users/current.json'
+      MICROSOFT_GRAPH_PROFILE_URL = 'https://graph.microsoft.com/v1.0/me'
 
       option :name, :microsoft_graph
 
@@ -64,7 +66,7 @@ def authorize_params
       end
 
       def raw_info
-        @raw_info ||= access_token.get('https://graph.microsoft.com/v1.0/me').parsed
+        @raw_info ||= access_token.get(profile_endpoint).parsed
       end
 
       def callback_url
@@ -73,11 +75,27 @@ def callback_url
 
       def custom_build_access_token
         access_token = get_access_token(request)
+        # Get the profile(microsoft graph / yammer) endpoint choice based on returned bearer token
+        @profile_endpoint = determine_profile_endpoint(request)
         access_token
       end
 
       alias build_access_token custom_build_access_token
 
+      def profile_endpoint
+        @profile_endpoint ||= MICROSOFT_GRAPH_PROFILE_URL
+      end
+
+      def determine_profile_endpoint(request)
+        scope = request&.env&.dig('omniauth.params', 'scope')
+
+        if scope&.include?('yammer')
+          YAMMER_PROFILE_URL
+        else
+          MICROSOFT_GRAPH_PROFILE_URL
+        end
+      end
+
       private
 
       def get_access_token(request)
diff --git a/spec/omniauth/strategies/microsoft_graph_oauth2_spec.rb b/spec/omniauth/strategies/microsoft_graph_oauth2_spec.rb
index b87a84c..01482d5 100644
--- a/spec/omniauth/strategies/microsoft_graph_oauth2_spec.rb
+++ b/spec/omniauth/strategies/microsoft_graph_oauth2_spec.rb
@@ -457,4 +457,82 @@
       end.to raise_error(OAuth2::Error)
     end
   end
+
+  describe 'Yammer profile endpoint support' do
+    describe '#profile_endpoint' do
+      context 'when no profile endpoint is determined' do
+        it 'defaults to Microsoft Graph profile URL' do
+          expect(subject.profile_endpoint).to eq('https://graph.microsoft.com/v1.0/me')
+        end
+      end
+
+      context 'when profile endpoint is already set' do
+        before { subject.instance_variable_set(:@profile_endpoint, 'https://custom.endpoint.com') }
+
+        it 'returns the previously set endpoint' do
+          expect(subject.profile_endpoint).to eq('https://custom.endpoint.com')
+        end
+      end
+    end
+
+    describe '#determine_profile_endpoint' do
+      let(:request) { double('Request', env: request_env) }
+
+      context 'when scope includes Yammer access_as_user scope' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => 'https://api.yammer.com/access_as_user' } } }
+
+        it 'returns Yammer profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://www.yammer.com/api/v1/users/current.json')
+        end
+      end
+
+      context 'when scope includes Yammer user_impersonation scope' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => 'openid profile https://api.yammer.com/user_impersonation' } } }
+
+        it 'returns Yammer profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://www.yammer.com/api/v1/users/current.json')
+        end
+      end
+
+      context 'when scope includes Yammer scope among other scopes' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => 'offline_access openid email profile https://api.yammer.com/access_as_user User.Read' } } }
+
+        it 'returns Yammer profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://www.yammer.com/api/v1/users/current.json')
+        end
+      end
+
+      context 'when scope includes multiple Yammer scopes' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => 'openid profile https://api.yammer.com/access_as_user https://api.yammer.com/user_impersonation' } } }
+
+        it 'returns Yammer profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://www.yammer.com/api/v1/users/current.json')
+        end
+      end
+
+      context 'when scope does not include any Yammer scopes' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => 'openid profile User.Read' } } }
+
+        it 'returns Microsoft Graph profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://graph.microsoft.com/v1.0/me')
+        end
+      end
+
+      context 'when scope is nil' do
+        let(:request_env) { { 'omniauth.params' => { 'scope' => nil } } }
+
+        it 'returns Microsoft Graph profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://graph.microsoft.com/v1.0/me')
+        end
+      end
+
+      context 'when omniauth.params is nil' do
+        let(:request_env) { { 'omniauth.params' => nil } }
+
+        it 'returns Microsoft Graph profile URL' do
+          expect(subject.determine_profile_endpoint(request)).to eq('https://graph.microsoft.com/v1.0/me')
+        end
+      end
+    end
+  end
 end