Let's Encrypt - Outlook Office 365 "Target principal name is incorrect"

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That domain has the wrong certificate, there is cloud.msgserv.com used. But it looks that this domain isn't used, so it's not so relevant.

This subdomain has the same problem:

Chain - duplicate certificates	
	1	CN=cloud.msgserv.com
	
	2	CN=cloud.msgserv.com
	
	3	CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US

The certificate is sent two times.

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