Sign-in option missing Adobe reader DC

Hi

We have a few machines within our environment that do not have a sign-in option (im not talking about the Sign function) with the free version of Adobe Reader DC. This option is usually located at the top / right side of the Adobe Reader DC window. Several other machines have the same version of software but DO have the sign in option available.

We'd like to get this fixed as people are unable to sign-in to their Adobe account to get access to their paid for add-ons.

Thanks for any help.