To prevent misuse of UNC paths by attackers, Microsoft is removing parameters that take UNC paths as inputs from the Exchange Server PowerShell cmdlets and the Exchange Admin Center.
In Exchange 2016 CU23 and later, the following certificate functionality in EAC is removed:
- Import & Export Exchange Certificate.
- Complete Exchange Certificate Request
- New Exchange Certificate Request from CA
- Renew Exchange Certificate Request
Therefore, you cannot use ECP to request a new certificate from a certificate authority, only EMS.
How to use EMS to create a certificate request, please refer to the official documentation: create-ca-certificate-requests
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