The FAQ says that
Creative Cloud Market is available to all paid Creative Cloud members. Single app and complete members with any plan—single user, Team, Education, or Enterprise—are eligible. Users can access Creative Cloud Market through Creative Cloud for desktop app.
Creative Cloud Photography plan members are not eligible to access Market through Creative Cloud for desktop. Free members can browse Market assets through Creative Cloud for desktop but cannot download content.
Thank you for the reply and for supplying the relevant link to the FAQ. I see now that Photography Plan members aren't eligible to access the free CC Market assets.
You are welcome !!