Update from Adobe Reader XI to 2017: unable to sign document with certificate

Hi,

as a company we introduced the digital signature with Digital ID created in Adobe Reader XI.

Now that security suppor is going to be interrupted on version XI, we are planning to move to Adobe Acrobat Reader 2017.

I installed that versione in order to make some test and I am not able to sign document with certificate anymore.

There is any change in the signature method or it's me who does something wrong?

Thank you for supporting.

Regards

Marco