Hi,
You'll need to delete the backup items for the storage account before you can delete the vault: Go to the vault > Backup items > Click the three dots on the far left, 'stop backup' then 'delete backup data.
If there was soft-delete enabled, you'll then need to disable that too, so it removes the items from soft-delete before you can proceed further, see: https://learn.microsoft.com/en-us/azure/backup/backup-azure-security-feature-cloud?tabs=azure-portal#enable-and-disable-soft-delete
Once done, you should be able to remove the vault. The Microsoft docs actually has a very good and comprehensive guide on how to do this which you can follow here: https://learn.microsoft.com/en-us/azure/backup/backup-azure-delete-vault?tabs=portal#delete-a-recovery-services-vault
Note: this is destructive, it will remove the vault!
Hope this helps, if it does, please mark as accepted so others can benefit from the solution.