Credit Note allocation to invoice is not shown in sandbox

Hi,
I need to test the credit note allocation to invoices in Sandbox, but the option is not shown in Sandbox UI, although I created a credit note with the same contact as the invoice.

The same scenario with live account shows the option, though.
Could someone help me?

Hi misaqui,

Thanks for letting us know about this, and sorry for the late reply! This feature should now be enabled on sandbox for you. Let us know if you need anything else.