You need to confirm whether you're a trader under the EU's Digital Service Act (DSA) rules. Traders are those who make any money from their apps in the EU, i.e. paid apps, or free ones with in-app purchases.
If you don't make any money from your apps, then you are not a trader and can confirm that you aren't. That would be all you need to do.
There should be an option in App Store Connect to confirm your status.
If you are a trader, you need to provide an address, email and phone number. But please note, those details will be displayed on your App Store pages so everyone in the EU can see them.