Xbox One X won’t connect to internet.

The DHCP is the part of your router that assigns internal IP addresses. If it can't connect it means that something else on your network is using the same IP address that your Xbox wants to use. You'll either need to find out what it is and change it, or you can try assigning a manual IP address to your console.

There loads of guides online.

Given that connect was not that much of a success it probably won’t have one but they haven’t said anything if you will be able to use an Xbox one connect on Xbox series X so hopefully you can

It typically helps us help you with specifics examples of what you have tried to do and what didn't work. That said, here's a bunch of examples to try:

"Xbox One Won’t Connect to Xbox Live [SOLVED]"

"13 Ways to Fix Xbox One Controller Won’t Connect Error"

"Xbox One X Won't Connect to Xbox Live"

Im connecting through wifi

Test your Xbox Live connection

If you’re unable to connect to Xbox Live, the first step is to run the network connection test on your Xbox One console to see what’s causing the problem:

1. Press the Xbox button
   to open the guide.
2. Select Settings.
3. Select All Settings.
4. Select Network.
5. Select Network settings. Any known outages will appear in the middle of the screen.
   
6. On the right side of the Network settings screen, select
   Test network connection.

If the connection test is successful, your console will connect to Xbox Live.

Note If you are prompted to update your console software, select
Yes.

If no joy..

Step 3: Power cycle your console and network hardware

To perform a power cycle reset, follow these steps:

1. Unplug the power cable from the back of the router, modem, or gateway for five minutes. If you have a router and a modem, unplug the power cable from both devices.
   
2. Restart your Xbox One console:
   1. Press and hold the Xbox button
      in the center of your Xbox One controller to open the Power Center.
   2. Select Restart console.
   3. Select Restart.
      Note If the console appears to be frozen, press and hold the
      Xbox button on the console for 10 seconds, until the console turns off. After the console shuts down, touch the
      Xbox button on the console again to restart.
      
3. After five minutes, plug the modem or gateway in first and wait for all the lights to return to their normal state.
   
4. If you are using a router, plug in the router and wait for all the lights to return to their normal state.