I cant get the activation code to work on my TV using a firestick device and no cable subscription

What model of TV do you have?

Thanks
Let's try the following:

1. Unplug the Fire TV stick from the power source and the HDMI port, wait for a minute, andplug it back in.
2. Restart or power cycle your modem and router, andunplug the power adapter on each for several minutes.
   Reconnect power to your modem first.
   When the modem is connected to your Internet service again, plug in your router.
3. Request you to forget and reconnect to the network and check if you are able to access the Home screen
   Navigate to Settings. Use the Fire Stick remote to navigate to the Settings menu and select the Network option.
   Select Your Network. Locate the offending network and press the Menu button for more options.
   Forget the Network.
4. After forgetting the current network, reconnect to a new Wi-Fi.
   Navigate to Settings. Use the Fire Stick remote to navigate to the Settings menu and select the Network option.
   From the list of networks, select the WiFi network that you would like to get connected to and enter the password.

Great
Keep me updating with your progress

Okay
Did you manage to go into the tv menu and turn on what you are happy with?

Your welcome
Do you have any additional questions I can help you with?