Hi Mibeatty,
Try following these steps to resolve your issue.
Backup your iPhone
https://support.apple.com/en-us/HT203977
Restart your iPhone
https://support.apple.com/en-us/HT201559
Update the iOS software on your iPhone
https://support.apple.com/en-us/HT204204
Open the Settings application. Select your name at the top, scroll down to the bottom, and Sign Out. Select Keep on Phone when available. Sign back into your Apple ID and select Merge when available.
If the issue persists, contact Apple Support.
All the best.