I have tested with 2 companies (FTDNA and Ancestry) uploaded that to GedMatch, My Heritage, Genetic Affairs and Geneanet. To be very blunt, not one of those labs or services have the same ethnicity results while they have close DNA matching results. What this means is the matching is based on real science ethnicity is not.
How they come to ethnicity is to take a pool of people and ask where they are born. Then map results. Well, I could be 100% of one ethnicity and be born in another country.. Populations are not static. What they report depends on how they define a geographic location. In short, don't waste your time on ethnicity. It is a false clue more often than a helpful one. If you go the the Weekend Chat I posted the results from all the companies.. You can see it for yourself.
it is in the opening comments section and you can see mine and a lot of others on WikiTree to draw your own conclusions.
If the labs wanted to be scientific they would do the following:
1. Share their results with each other in one central data base (doubt that will ever happen)
2. Define areas so everyone is using the same measure and same terminology
3. Collect at least 3 or more generational views of where people came from and their belief concerning their ethnicity. (Belief and reality can still be at odds)
4. Work with genetic anthropologists.
Then I might believe what they put out on this topic.
You will get your best answers from the matching. Time spent on that will be rewarded. Ignore the ethnicity it is marketing hype not real science for the reasons stated above. Yes you may be one of the lucky ones where it actually looks like it works. But there are so many others were it doesn't...