Run the following command, replacing identity with the actual name of your server and the externalurl with the actual URL: ...

Run the following command, replacing identity with the actual name of your server and the externalurl with the actual URL:  set-UMvirtualdirectory -identity "MYSERVER\UnifiedMessaging (Default Web Site)" -externalurl https://exchange.contoso.com/UnifiedMessaging/Service.asmx  -BasicAuthentication:$True
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