Usually this error (Cannot import a certificate with a thumbprint of XXXXXXXXXXXXXX) displays when the certificate has been already installed on the server.
If it is and you are trying to enable services on the server for this certificate, you can use a command:
Enable-ExchangeCertificate -Thumbprint [THUMBPRINT] -Services "POP, IMAP, IIS, SMTP"
Note: replace [THUMBPRINT] with the correct thumbprint.
If the certificate is installed correctly and the error is displaying remove the product with Thumbprint in the error massage.
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