I cannot recover the amount of a domain purchased with invalid characters

I bought a domain with characters which do not conform to the ENS specifications at auction.

When I enter the domain in opensea it indicates that: "ATTENTION: This name may have been incorrectly sold as a short name containing characters which do not conform to the ENS specifications. Such a name is therefore useless. If you own this asset, you may accept the offer below from ENS to get a refund. "

There is indeed an ENS offer for the same amount that I bought at auction.

The problem is that in that offer the button to accept the offer does not appear, so I cannot recover the amount paid.

How can I do to return the domain and have the amount refunded?

Thank you.