diff --git a/packages/integration-react/src/api/ScmAuth.test.ts b/packages/integration-react/src/api/ScmAuth.test.ts
index 2d0ea9b97d..4ebfef749e 100644
--- a/packages/integration-react/src/api/ScmAuth.test.ts
+++ b/packages/integration-react/src/api/ScmAuth.test.ts
@@ -141,6 +141,58 @@ describe('ScmAuth', () => {
     });
   });
 
+  it('should support additional provided scopes from the caller', async () => {
+    const mockAuthApi = {
+      getAccessToken: async (scopes: string[]) => {
+        return scopes.join(' ');
+      },
+    };
+
+    const githubAuth = ScmAuth.forGithub(mockAuthApi);
+    await expect(
+      githubAuth.getCredentials({
+        url: 'http://example.com',
+        additionalScope: {
+          customScopes: { github: ['org:read', 'workflow:write'] },
+        },
+      }),
+    ).resolves.toMatchObject({
+      token: 'repo read:org read:user org:read workflow:write',
+    });
+
+    const gitlabAuth = ScmAuth.forGitlab(mockAuthApi);
+    await expect(
+      gitlabAuth.getCredentials({
+        url: 'http://example.com',
+        additionalScope: { customScopes: { gitlab: ['write_repository'] } },
+      }),
+    ).resolves.toMatchObject({
+      token: 'read_user read_api read_repository write_repository',
+    });
+
+    const azureAuth = ScmAuth.forAzure(mockAuthApi);
+    await expect(
+      azureAuth.getCredentials({
+        url: 'http://example.com',
+        additionalScope: { customScopes: { azure: ['vso.org'] } },
+      }),
+    ).resolves.toMatchObject({
+      token: 'vso.build vso.code vso.graph vso.project vso.profile vso.org',
+    });
+
+    const bitbucketAuth = ScmAuth.forBitbucket(mockAuthApi);
+    await expect(
+      bitbucketAuth.getCredentials({
+        url: 'http://example.com',
+        additionalScope: {
+          customScopes: { bitbucket: ['snippet:write', 'issue:write'] },
+        },
+      }),
+    ).resolves.toMatchObject({
+      token: 'account team pullrequest snippet issue snippet:write issue:write',
+    });
+  });
+
   it('should handle host option', () => {
     const mockAuthApi = {
       getAccessToken: jest.fn(),
diff --git a/packages/integration-react/src/api/ScmAuth.ts b/packages/integration-react/src/api/ScmAuth.ts
index be3216962d..f450d63cec 100644
--- a/packages/integration-react/src/api/ScmAuth.ts
+++ b/packages/integration-react/src/api/ScmAuth.ts
@@ -35,6 +35,9 @@ type ScopeMapping = {
   repoWrite: string[];
 };
 
+// An enum of all supported providers
+type ProviderName = 'generic' | 'github' | 'azure' | 'bitbucket' | 'gitlab';
+
 class ScmAuthMux implements ScmAuthApi {
   #providers: Array<ScmAuth>;
 
@@ -93,12 +96,14 @@ export class ScmAuth implements ScmAuthApi {
         github: githubAuthApiRef,
         gitlab: gitlabAuthApiRef,
         azure: microsoftAuthApiRef,
+        bitbucket: bitbucketAuthApiRef,
       },
-      factory: ({ github, gitlab, azure }) =>
+      factory: ({ github, gitlab, azure, bitbucket }) =>
         ScmAuth.merge(
           ScmAuth.forGithub(github),
           ScmAuth.forGitlab(gitlab),
           ScmAuth.forAzure(azure),
+          ScmAuth.forBitbucket(bitbucket),
         ),
     });
   }
@@ -116,7 +121,7 @@ export class ScmAuth implements ScmAuthApi {
       };
     },
   ): ScmAuth {
-    return new ScmAuth(authApi, options.host, options.scopeMapping);
+    return new ScmAuth('generic', authApi, options.host, options.scopeMapping);
   }
 
   /**
@@ -139,7 +144,7 @@ export class ScmAuth implements ScmAuthApi {
     },
   ): ScmAuth {
     const host = options?.host ?? 'github.com';
-    return new ScmAuth(githubAuthApi, host, {
+    return new ScmAuth('github', githubAuthApi, host, {
       default: ['repo', 'read:org', 'read:user'],
       repoWrite: ['gist'],
     });
@@ -165,7 +170,7 @@ export class ScmAuth implements ScmAuthApi {
     },
   ): ScmAuth {
     const host = options?.host ?? 'gitlab.com';
-    return new ScmAuth(gitlabAuthApi, host, {
+    return new ScmAuth('gitlab', gitlabAuthApi, host, {
       default: ['read_user', 'read_api', 'read_repository'],
       repoWrite: ['write_repository', 'api'],
     });
@@ -191,7 +196,7 @@ export class ScmAuth implements ScmAuthApi {
     },
   ): ScmAuth {
     const host = options?.host ?? 'dev.azure.com';
-    return new ScmAuth(microsoftAuthApi, host, {
+    return new ScmAuth('azure', microsoftAuthApi, host, {
       default: [
         'vso.build',
         'vso.code',
@@ -223,7 +228,7 @@ export class ScmAuth implements ScmAuthApi {
     },
   ): ScmAuth {
     const host = options?.host ?? 'bitbucket.org';
-    return new ScmAuth(bitbucketAuthApi, host, {
+    return new ScmAuth('bitbucket', bitbucketAuthApi, host, {
       default: ['account', 'team', 'pullrequest', 'snippet', 'issue'],
       repoWrite: ['pullrequest:write', 'snippet:write', 'issue:write'],
     });
@@ -240,11 +245,18 @@ export class ScmAuth implements ScmAuthApi {
   #api: OAuthApi;
   #host: string;
   #scopeMapping: ScopeMapping;
+  #providerName: ProviderName;
 
-  private constructor(api: OAuthApi, host: string, scopeMapping: ScopeMapping) {
+  private constructor(
+    providerName: ProviderName,
+    api: OAuthApi,
+    host: string,
+    scopeMapping: ScopeMapping,
+  ) {
     this.#api = api;
     this.#host = host;
     this.#scopeMapping = scopeMapping;
+    this.#providerName = providerName;
   }
 
   /**
@@ -254,6 +266,16 @@ export class ScmAuth implements ScmAuthApi {
     return url.host === this.#host;
   }
 
+  private getAdditionalScopesForProvider(
+    additionalScopes: ScmAuthTokenOptions['additionalScope'],
+  ): string[] {
+    if (!additionalScopes?.customScopes || this.#providerName === 'generic') {
+      return [];
+    }
+
+    return additionalScopes.customScopes?.[this.#providerName] ?? [];
+  }
+
   /**
    * Fetches credentials for the given resource.
    */
@@ -267,7 +289,17 @@ export class ScmAuth implements ScmAuthApi {
       scopes.push(...this.#scopeMapping.repoWrite);
     }
 
-    const token = await this.#api.getAccessToken(scopes, restOptions);
+    const additionalScopes =
+      this.getAdditionalScopesForProvider(additionalScope);
+
+    if (additionalScopes.length) {
+      scopes.push(...additionalScopes);
+    }
+
+    const uniqueScopes = [...new Set(scopes)];
+
+    const token = await this.#api.getAccessToken(uniqueScopes, restOptions);
+
     return {
       token,
       headers: {
diff --git a/packages/integration-react/src/api/ScmAuthApi.ts b/packages/integration-react/src/api/ScmAuthApi.ts
index 44b007c4a2..be65842bc1 100644
--- a/packages/integration-react/src/api/ScmAuthApi.ts
+++ b/packages/integration-react/src/api/ScmAuthApi.ts
@@ -44,6 +44,16 @@ export interface ScmAuthTokenOptions extends AuthRequestOptions {
      * the ability to create things like issues and pull requests.
      */
     repoWrite?: boolean;
+    /**
+     * Allow an arbitrary list of scopes provided from the user
+     * to request from the provider.
+     */
+    customScopes?: {
+      github?: string[];
+      azure?: string[];
+      bitbucket?: string[];
+      gitlab?: string[];
+    };
   };
 }