Policy
Do not prompt for client certificate selection when no certificates or only one certificate exists.
This policy setting allows you to manage whether users are prompted to select a certificate when no certificate or only one certificate exists. If you enable this policy setting, Internet Explorer does not prompt users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate. If you disable this policy setting, Internet Explorer prompts users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate. If you do not configure this policy setting, Internet Explorer does not prompt users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate.
d2770fba43ae IZ_PolicyNoPromptForOneOrNoClientCertificate_3 Registry
Copy registry mappings
HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\1A04HKCU\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\1A04Policy notes
This policy setting allows you to manage whether users are prompted to select a certificate when no certificate or only one certificate exists. If you enable this policy setting, Internet Explorer does not prompt users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate. If you disable this policy setting, Internet Explorer prompts users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate. If you do not configure this policy setting, Internet Explorer does not prompt users with a "Client Authentication" message when they connect to a Web site that has no certificate or only one certificate.