Yammer supports any SAML 2.0 compliant Identity Provider (IdP). These include ADF 2.0 & 3.0, Windows Azure AD, Shibboleth, OneLogin, PingFed, Okta etc. The first step to implementing Single Sign-On (SSO) with Yammer is to open a yammer SSO service request. You will be asked to provide your IdP metadata and token signing certificate so you may want to speed up the data collection phase by providing the required files as soon as you open the service request. In the case of ADFS IdP, the metadata can be downloaded from - https://your-server-URL/FederationMetadata/2007-06/FederationMetadata.xml and you may use this instruction to extract the token signing certificate. You should zip the token signing certificate before sending it to the Yammer support rep. because .cer files are quarantined by Microsoft IT.
Once you’ve provided the required files, Yammer support will create the connection and respond back with the Yammer Service Provider (SP) metadata. At this point, the connection is inactive and there will be no impact on users' experience. Download the metadata file and start the process of creating the relying party trust and claims rule as described below.