Hi Binh,
Based on the screenshot, I'd like to confirm if you have deployed Single-Sign on with Office 365. If so, have you deployed AD FS 2.0 or AD FS 3.0?
If you have really set up an SSO, please check the following things:
1. Please make sure the Outlook for Mac client has been updated to date.
2. Activate it using an account with onmicrosoft.com.
3. For AD FS 2.0, please install 2989956.
4. For AD FS 3.0, check to see if you have installed 2975719 and 2919355
5. In certain AD FS configurations, the administrator may not have forms-based authentication enabled on the AD FS server. This prevents Mac clients from logging in as required by the authentication process.
To resolve this issue, set up AD FS to use forms-based authentication as the secondary form of authentication. To do this, follow the appropriate steps for the version that you use.
Note: The currently configured authentication methods can remain unchanged. For example, if Windows Integrated Authentication is configured as the primary authentication method, it can remain configured this way.
If you use AD FS 2.0
Enable forms-based authentication by using the steps in the following Microsoft TechNet topic:
AD FS 2.0: How to Change the Local Authentication Type
If you use AD FS in Windows Server 2012 R2
Follow these steps:
a. In Server Manager on the AD FS 3.0 server, click Tools, and then select AD FS Management.
b. In the AD FS snap-in, click Authentication Policies.
c. In the Primary Authentication section, click Edit next to Global Settings.
d. In the Edit Global Authentication Policy dialog box, click the Primary tab, and then under Extranet and under Intranet, click to select the Forms Authentication check box.
Regards,
Edward Qu
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RE: Could not activate Outlook
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