I suspect some others will be in the same position as me. As the SOTA associations don’t neccessarily cover all of a country, you can be living (Home QTH) outside of any SOTA region. Where there is only one association within a country, the decision is clear however in countries with more than one region, such as Germany with both DL and DM associations, is their any rule which one, one should be registered in?
I have registered in DL, simply as the majority of the activations I have made have been in DL however as I have now moved further west than when I first arrived in Germany, both DM and DL summits are around the same distance from me. I am not in either a DM or DL region, as there are no qualifying summits around here.
The system allows to you register under any association, as shown by I3VAD who is regstered in the DL association and is shown as the leading chaser in the Chaser Role of Honor. Perhaps he is a Germany based Italian?