Data not connecting since new 26 update

The only way my data (anything - texts, calls, internet, hotspot, everything) will work now is if I log OUT of my apple account on my iphone 13 mini.. I did the 26 update, no issues at all! Then I did the second update released for people having connection issues - NOW I can't connect when logged in. This is a brand new phone, I've tried all the online troubleshooting tips. Toggled airplane mode, I've reset network settings, reset ALL settings, turned off and back on, turned wifi, bluetooth, hotspot, cellular data off and tried again. Did troubleshooting with my cellular service, too. None of these work, only thing that works is me being logged out of apple. Then I can connect to the internet/my phone service. My macbook pro works just fine logged-in to the cloud; but not the phone that's recently updated. Please fix this asap! Help!! I need this for work! Thank you