How to force your Azure AD Connect server to use only TLS v1.2 when connecting to Microsoft 365?

Note: Microsoft has deprecated TLS 1.0 and TLS 1.1 for most Microsoft 365 services worldwide, rendering TLS 1.2 as the only viable option. As a result, customers who still use TLS 1.0 and 1.1 to communicate to Microsoft 365 via PowerShell from their ADManager Plus server may face some issues in establishing the connection. We advise ADManager Plus customers to enforce TLS 1.2 when connecting to Microsoft 365 to avoid running into connectivity issues.

Objective: To enforce TLS v1.2 when connecting to Microsoft 365.

Solution: Follow the below steps to perform this operation:

1. Step 1: Right click Windows PowerShell and select Run as administrator.
2. Step 2: Run Connect-MsolService.
3. Step 3: Enter the credentials to sign in to your Microsoft account.
4. Step 4: If TLS v1.2 is not enforced, the below error message will be displayed.

   [System.Net.ServicePointManager]::SecurityProtocol =
   [System.Net.SecurityProtocolType]::Tls12;

   Follow the steps provided in this Microsoft article to enable TLS v1.2 and fix the error.

5. Step 5: Restart ADManager Plus.