Hi garyr70974732,
Is it a subscription of a perpetual licence for Acrobat DC?
If its a subscription Sign In using the Adobe ID under which you have the subscription.
Follow the connectivity troubleshooting steps in order to activate Acrobat DC Solutions to sign-in, activation, and connection errors with Creative Cloud and Creative Suite applications.
If you need to manage your account you can login at Adobe: Creative, marketing and document management solutions
Regards,
Aadesh