Through the same wifi it is possible for us to enter our worlds, but when we use our wifi no one can connect, it tells us that "Cannot connect to the world".

What sort of wifi is it? 

Thank you for your report!
We're tracking this issue in MCPE-36190, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
_{-- I am a bot. This action was performed automatically! The ticket was resolved by one of our moderators, and I left this message to give more information to you.}

Sorry, I wasn't attentive, I don't know how to say it in English but literally translated it is are mobile data, it's the internet that gives the subscription to a telephone company, We have already activated the option to use that internet but we still cannot join