Hi,
Welcome to our forum.
You have set a type of encryption with a card to your email account configured on your Outlook client, right? According to my research, this article may be useful to you:
Smart Card Group Policy and Registry Settings
Since here we mainly focus on general issues about Outlook desktop client but your question is more related to encryption and this encryption method may be set by the administrator or your mialbox provider, if the issue continues, it is suggested to
contact your organization admin or your mialbox provider for more help.
Hope this can be helpful.
Regards,
Aidan Wang
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