Could not communicate with the server with iPhone 6s

Hi Nonpta,

Check to make sure you're not affected by an outage at this time:

Apple - Support - System Status

If you're still having trouble logging in, turn off Low Power Mode and test using another internet connection.

Since you're on Wi-Fi, test on another Wi-Fi or using your mobile network.

Let us know if that helps.

Thanks for using the Apple Support Communities.

Hey there Nonpta,

Check to see if restarting helps get you connected to the server: Restart your iPhone - Apple Support

If the issue continues, reach out to Apple Support for further assistance: Get Support

Kind regards.