Remove iCloud from accounts in Mail
I want to use the Mail app on my phone only for emails from my personal email address. However the app also has my iCloud email on it. I tried to follow these steps:
"Open up Settings, then at the top, tap on your name where it says “Apple ID, iCloud, iTunes & App Store.” Once there, tap on iCloud, then switch mail off"
but the iCloud button is greyed out. How can I disable or remove iCloud from being an available account in Mail?
iPhone SE (3rd generation)