Not letting me join

Kindly restart your device along with restarting your internet connection then try again.

It keeps telling me unable to connect

Hi, I hope you're doing great out there despite the issue that you're experiencing. I am an Independent advisor and I am here to help you in regards to your concern.

Depending with the issue or error that you’re getting. If I may ask, what is the error or issue that you’re experiencing whenever you’re trying to join your friends world?

Glad to hear! Please reach back if you have further questions.

Thanks,
Kyle

I see, have you tried signing up through Ubisoft's site instead?

Make sure you choose the multi-access plan: https://store.ubisoft.com/ubisoftplus

Thanks,
Kyle