The government being this sloppy at getting accents right is surprising, I would expect them to value accuracy and a clean paper trail when handling names.
That tells me you're German, I didn't even need to see the ä and ß.
Even in the UK I encounter websites that won't accept my Norwegian address because it begins with Ã…. English speaking countries generally are pretty bad at this sort of thing.
By the way, the accents can often be used to force the right pronunciation of a foreign name on native speakers (at least in US, where Spanish names are so widespread). So e.g. use "á" if you want it to be pronounced [a] etc.