Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
This policy controls whether the user is prompted to select a client certificate when more than one certificate matches 'AutoSelectCertificateForUrls' (Automatically select client certificates for these sites). If this policy is set to True, the user is prompted to select a client certificate whenever the auto-selection policy matches multiple certificates. If this policy is set to False or not set, the user may only be prompted when no certificate matches the auto-selection.