AP Isolation

Ok so i hope this might help. i was trying to connect my Chromecast device to my home internet but it keep saying to turn off ip isolation, anyway i check on the t-mobile internet app but i didn't find no clues then i went to my phone settings i tap on my internet to open the settings and where u see ip settings it had DHCP so i switched it to STATIC witch is the second option it gives u. So i start all over again i reset my Chromecast and start from the beginning and this time it work perfectly, now my phone is an android idk if iPhones are the same but i hope this can help someone out