Xbox Series X is my system.
Completed all series in the “Power Tour”. Try to enter the Power Reward Showcase and It says “Series Locked: Power Reward Showcase You do not have a D. Challenger 18 in your garage and cannot enter this event.”.
I do not even see that car available to buy unless I am misinterpreting what D. Challenger 18 is (presuming 2018 Dodge challenger).
Reporting this as a bug now.
I am enjoying the game but was hoping to complete most of the Tours before fully going online.