You've possibly deleted it, go to the App Store app on the phone and search for 'apple mail' or 'mail' and see if it has a cloud icon for redownloading
How do I get lost mail icon back to home screen on iPhone X?
3 replies
Thank you. I checked on that. It does not have an icon for downloading. It shows as already installed with “open” next to it but won’t work/open or show in the home screens
Have you tried a soft-reset / reboot of the phone ?
lost mail icon on iphone x