Good afternoon Karina,
Hoping you are well :)
I apoligize for the late response, the mobile device does not track devices linked to it. Each mobile device has a limit of how many devices to connect to it at the same time,
this would mean that all the devices would have to be actively connected to the mobile wifi device to be the issue.
Does the tablet give any specific message when you try and connect it?
I look forward to your reply,
Have a wonderful weekend ahead.