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Slack SAML


Acceptto integrates with Slack via its SAML solution and provides a single sign-on (SSO) MFA to ensure the convenience of cloud SSO without its potential security risks. Multi-Factor Authentication (MFA) is an extra layer of security used when logging into websites or apps. Individuals are authenticated through more than one required security and validation procedure that only you know or have access to. SAML-based SSO gives members access to Slack through an Acceptto identity provider (IDP).


  1. An Acceptto account with a configured Identity Provider and LDAP Agent. (See this page for the instructions)

Acceptto SAML Configuration as Identity Provider (IdP)#

  1. Login to the Acceptto Dashboard with an administrative account and go to Applications.

  2. Create a new application by selecting Create New Application.

    New Acceptto app

  3. In the New Application form, enter the following values under the General tab.

    • Name - The application name displayed in the admin panel and application portal and used for push notifications and audit logs. (e.g. Slack)
    • Type - Select "SAML Service Provider" from the options.
    • Out of Band Methods - Select the allowed methods for approving MFA requests.
    • Message for MFA Requests - Enter the user-facing message for Push, SMS, and email MFA requests (optional).

    General settings

  4. Under the SAML Service Provider Configuration tab, enter the following values:

    • Issuer or Entity ID - Enter
    • Sign in URL - The URL used to access your Slack instance, such as
    • NameID Format - Select "Persistent" from the dropdown menu.
    • Name Identifier- Select "Email" from the dropdown menu.
    • Assertion Consumer Service (ACS) URL - Enter
    • Single Logout URL -
    • Algorithm - RSA-SHA256

    Service Provider settings

  5. Add new attribute as below:

    • Friendly Name: Email
    • Name: User.Email
    • Value: mail
    • Name format: unspecified
  6. Click on Sign Message.

    Service Provider settings

  7. Click Save.

Configure Slack as SAML Service provider#

  1. Download the SAML metadata and certificate for your organization from Acceptto.

    Metadata Download at<myorganization>/saml/download/metadata or view at<myorganization>/saml/metadata

    Certificate Download at<myorganization>/saml/download/cert

  2. Login to your Slack instance as an administrator.

  3. Navigate to Settings & administration > Workplace settings:

    New Acceptto app

  4. Select Authentication.

  5. Click Configure for SAML Authentication. Fill the following fields with Acceptto information.

    Configure SAML

  6. Click on Edit and copy the Acceptto Certification into the Public Certificate section.

  7. Save the configuration.

    Sign in

Test Your Setup#

  1. Login to the Slack panel.

    New Acceptto app

  2. Click on Sign in with.

  3. You will be redirected to the Acceptto SAML page.

    Acceptto Sign in

  4. After successful authentication through Acceptto, you will see the Slack panel:

    Slack dashboard


If you require assistance, please email us at


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All company, product, and service names used in this document are for identification purposes only. The use of these names, trademarks, and brands do not constitute an endorsement by the Acceptto Corporation.

Slack is either registered trademarks or trademarks of Slack and/or one or more of its subsidiaries in the United States and/or other countries.