Is this a new set being set up for the first time, or one that previously worked?
MAC address of all zeros indicates no connection between the TV's network circuits and the rest of the TV.
I'd suggest doing a Factory Reset and setting the TV up again from scratch. If the MAC is still reported as all zeros, take it back to where you purchased it if you still can.
Otherwise ,,,
TCL support:
https://support.tclusa.com/televisions
1-877-300-8837
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
