Konica Minolta - Disable the Certificate Verification Settings option
Log in to the MFP's Web interface as administrator
Select Security (see page).
From the menu, select Certificate Verification Settings.
For the Certificate Verification Settings option, select Off and save settings with OK

NOTE: If you don't turn off Certificate Verification, the warning message will be displayed only once after the reboot your MFD.
It is required to change
Certificate Verification Level Settings, otherwise the embedded terminal cannot be installed in most cases.
It is also recommended to turn off validation of certificate period. This prevents a situation when user authenticates with invalid credentials (invalid card, invalid PIN) and it takes 1 minute to display the information about invalid credentials.
Log in to the MFP's Web interface as administrator.
Navigate to Network > OpenAPI setting.
Under Certificate Verification Level Settings configure Client Certificates to Do not request.
In the same place set Validity Period to Do not confirm.