It says iCloud storage full even though I purchased 50 GB

Hello nahlaxx97,

We would like to see how we can help you with backing up to iCloud. Check out this link for more details about why you are seeing this error, and get back to us with any questions you may have: If you can't back up to iCloud - Apple Support

"If an alert says that there's not enough iCloud storage

1. In iOS or iPadOS, go to Settings > [your name].
2. Tap iCloud. At the top, you can check how much iCloud storage you've used.
3. Tap Manage Account Storage or Manage Storage.
4. Tap Backups, then tap the device you're using. Under Last Backup and Backup Size, you can check Next Backup Size. It may take a few minutes for your device to calculate Next Backup Size. 
5. If your backup needs more space than the amount you have available in iCloud, you can: 

• Delete information that you don't need to reduce the size of your backup
• Upgrade your iCloud+ plan to get more space

6.If you still need help, contact Apple Support."

Cheers!