After extensive testing and completing the following operations: without success
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clear all safari iOS cookies > set safari as default > rest internet > rest phone > reinstalled battle.net > reset phone > connect to neighbors Wi-Fi > log into battle.net mobile app > unable to connect
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Deleted App > Reset Mobile Phone > reinstalled battle.net app > rest phone > internet reset > connected to home Wi-Fi network > log into battle.net app > unable to connect
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Same as step #2, with the exception of using 5G mobile network instead of home Wi-Fi > unable to connect
Current iOS version: 18.1
Model Name: iPhone 11 Pro Max