I’ve seen people say Rochshox stuff bought from bike-discount in Germany they’ve just had sent to Fisher in UK for warranty with no problem. Should be same from Alltricks. EU law says you can have your warranty apply anywhere in the EU for an EU bought product.
Don’t let them wriggle out claiming grey imports either. If it has been sold by an EU retailer, shipped from their warehouse within the EU then it’s an EU purchase no matter where it was imported from to get to them. Oh and supposedly EU law says you have a basic right to 2 years warranty, regardless of what the retailer or manufacturer say, though there are catches.