Recognising the ‘Digital Signature’ usage option from a third-party Digital ID Certificate

Please can you help with this problem:

How can I get the ‘Digital Signature’ usage option, which is included in my third-party certificate, to be recognised by Acrobat Reader as a ‘Usage Option’, so that it will get added to my choice of Digital IDs for signing?  

Background:

My Digital ID Certificate - recognised by Acrobat Reader DC as a trusted and valid Certificate issued by a third party - has many Intended usages, including “Digital Signature”. However, when checking “Usage Options” under Preferences > Signatures >Identities & Trusted Certificates >More, only ‘manage attribute certificates’ and ‘personalize’ are listed. Consequently, when setting it up for signing, Reader promises “The following Digital ID will be added to your list of Digital ID that you can use for digitally signing:”. But on clicking ‘continue’ to the next screen it does not get added.

Thanks for lending a hand

Paul