Resolving SSL Protocol Error in Exchange Online Management Module (4378303)

When attempting to connect to Exchange Online using the ExchangeOnlineManagement module, users may receive the following error message:

ERROR: [0-0-0-00000000] Error: The underlying connection was closed: An unexpected error occurred on a receive.
The underlying connection was closed: An unexpected error occurred on a receive.
The specified value is not valid in the 'SslProtocolType' enumeration.

• The error is related to the SSL protocol being used by the ExchangeOnlineManagement module.

• The issue is often caused by an incompatible version of the module. In this case, version 3.7.1 was installed, whereas the required version for the current MNE release is 3.1.0.

• Additionally, an outdated or missing Microsoft Graph module may contribute to the problem.

To resolve this issue, follow these steps:

1. Uninstall the current ExchangeOnlineManagement module:
   Run the following command to remove all installed versions:

   Uninstall-Module -Name ExchangeOnlineManagement -AllVersions -Force -ErrorAction SilentlyContinue

2. Install the required version (3.1.0) of the ExchangeOnlineManagement module:

   Install-Module -Name ExchangeOnlineManagement -RequiredVersion 3.1.0 -Scope AllUsers -Force

3. Ensure that the Microsoft Graph SDK is installed:
   The required versions are 1.25 or 1.27. Install it using the following command:

   Install-Module Microsoft.Graph -RequiredVersion 1.27 -Scope AllUsers -Force

4. Restart the PowerShell session and attempt the connection again.

If the issue persists after following these steps, further investigation may be required.