Apologies for the inconvenience !!!. To access Adobe target Classic , you need to have Target classic credentials which can be created raising a client care request.
If you are a supported user for your company account you can contact Customer Care. To contact Customer Care by telephone, call 1-800-497-0335. Toll free numbers outside the United States can be found on the Adobe Digital Marketing Customer Care Regional Phone Numbers page (https://helpx.adobe.com/contact/dma-external/DMACustomeCareRegionalPhoneNumbers.html). When asked to select an option for your product, press 3 to contact the Target team.