Veryolddog Said:
“Sync mail on iPhone and iPad air: How to sync mail on iPhone and iPad Air? Used to be in sync, suddenly not. Went to iCloud in settings to toggle the mail button to make them in sync, but mail is no longer listed as an app to sync. Where did this function go?”
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Use a New App Password for Each Device:
Do you use an App Password? If so, try a new App Password. Create a unique on for each device. Remove the current one, and then use the new one instead. Sometimes, changes (i.e. updates) are made to the device, and then mail server syncing becomes an issue (which is what a new App Password it intended to fix). For example, you'd go here for gmail: Sign in with App Passwords - Google Account Help - Google