Hello @Danilo Ortiz
In your case it appears to be an issue within the azure side SDK causing the error "input provided for the call is invalid". My recommendation is to try from command line method like azure PowerShell as a quick workaround to get you unblocked from this situation.
Follow this link from Microsoft azure backup documentation for help with disabling soft-delete from vault using Azure PowerShell: https://learn.microsoft.com/en-us/azure/backup/backup-azure-security-feature-cloud#disabling-soft-delete-using-azure-powershell
Set-AzRecoveryServicesVaultProperty -VaultId $myVaultID -SoftDeleteFeatureState Disable StorageModelType : StorageType : StorageTypeState : EnhancedSecurityState : Enabled SoftDeleteFeatureState : Disabled
Note: If items were deleted before soft-delete was disabled, then they'll be in a soft-deleted state for 14days. To immediately delete them, the deletion operation needs to reversed and then performed again.
If you still happen to see the same error, I would recommend logging a support case with Azure backup team for diagnosing this issue.
If this does answer your question, please accept it as the answer as a token of appreciation.