Exchange mail server not working
product name: iPhone 8 plus
version: iOS 12
capacity : 256 GB
problem: it might be caused by the existing iPhone 8 plus replacing the malfunctioned one in September 2018, the 'exchange' mail server is not working. The following message appeared : Account error: Exchange - Cannot get mail.
The connection to the server failed.
Don't know any troubleshooting steps, would appreciate a solution.
iPhone 8 Plus, iOS 12, 256GB