Hello! My name is*****
It looks like there is a problem with the iCloud account on your iPhone. To solve the problem, I suggest removing the account from your iPhone and then setting it up again.
To do that, go to Settings and tap on iCloud. Swipe to the bottom and you will see Delete account or Sign out. Tap on it and confirm.
After that, you can tap on iCloud again and then re-add the account. Just make sure to use the correct password. That should solve the problem.
Let me know the results.
Do you still require assistance with this issue?
Let me know,IT Miro