backup incorrectly reports not enough storage for backup

Hi ron274,

Thanks for posting here in Apple Support Communities. We'll. have to make sure that you have enough iCloud storage for the backup and not just enough iPhone storage. You can see exactly what we're referencing here: What's the difference between device storage and iCloud storage? - Apple Support

If you need help freeing up iCloud storage space then please referencing this article as it may help to address the issue you're facing: Manage your iCloud storage - Apple Support

Kind regards.