Copilot of Microsoft 365- Issue in using Copilot in MS Outlook app with Digital Signatures Enabled

Hello Community ,

Am using Copilot for MS365 in Outlook app. I have digital signatures enabled( S/MIME Certificate).

When i open a new email to draft , CoPilot is disabled, but gets enabled when i disable the Digital Sign option.  Certificate is used just for signing , and not for encryption.

Checked in Microsoft site, this is what they say . Anyone encountered this issue? Any workaround?