Prerequisites

Yammer integration in FortiCASB requires enforcing Office 365 identity in Yammer. When turning this setting on, it may disrupt Yammer users’ access to Yammer, especially those who do not have Office 365 account, they will be locked out of Yammer. Therefore, before making this change, please inform your Yammer users to do the following:

• Make sure that all Yammer users have Azure AD account. You can figure out who does not have an Azure AD account by comparing the list of users on Yammer with the list of users in Office 365. From Yammer, go to Settings > Edit Network Settings > Export Users to export all users.
• Help the Yammer users who do not have Azure AD account to get Azure AD account before enforcing Office 365 identity.

You need to be a global administrator on Office 365 and be synchronized to Yammer as verified administrator to enforce Office 365 identity in Yammer.

From your Yammer account, go to Settings > Edit Network Settings > Admins to verify your Yammer admin account is synchronized to Office 365 global administrator account. Below is a screen shot of a synced admin in Yammer: