Hi @Seller_IQo80d99W2DzP
I do see that the team in charge replied to you on case ID 12185704982.
"Please note that some sellers experienced system errors between 27 February 1100 GMT and 28 February 0400 GMT. If you encountered this issue during that specific timeframe, the problem has since been resolved and you should now be able to process refunds normally."
I do recommend you follow up in the case above.
Christine