I can’t do or join a group research post

It’s not that, I never create a group research post cause every time I want to create one it shows me an error

some services have been currently disabled due to so many people being at home and online this could be why. not saying it is why but its possible. also the person you mean it may be that they need to power cycle their console to get notifications(maybe)
sometimes it needs a good refresh after long periods of being on.

Have you tried doing a Hard reset on your console yet? Press the Xbox power button for 10 seconds and then restart your console and try again.

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you with your concern.

We may need to perform an extended powercycle and reset your network hardware by following the steps below:

" 1. Unplug the power cable from the back of the router, modem, or gateway for 5 minutes. If you have a router and a modem, unplug the power cable from both devices.

2. Press and hold the Xbox button on your console for 10 seconds or until it turns off then wait for 2 minutes before turning it on again.

3. After 5 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."

Tente limpar o cache do seu console, caso contrario entre em contato com o suporte : https://support.microsoft.com/