This procedure is applicable for iOS devices (iPhone, iPad, etc.) running iOS how-to-update-your-microsoft-exchange-password-on-your-iphone-ipad-ios-11-or-higherup11 and higher. If you have recently changed your network/email password, please follow the below instructions to update your password on your iPhone or iPad.
From the Home screen tap Settings.
Scroll down and tap Accounts & Passwords.
Tap your company email account. This might be called Exchange or a name that identifies your company name or email address.
Tap the email address next to Account.
Delete the current password and enter your new password and tap Done.