Heh, yes, I am ... on Steam the name Falkenstein was available when I chose it, but I was slower to Xbox gaming than I was to PC gaming, somebody else is "Falkenstein" there and so I had to generate an alternative off the top of my head (all the usual suspects were already taken as Gamertags by the time I arrived on the Xbox scene), so don't send the Xbox Falkenstein all your money, or include them in your will, use the Steam Falkenstein for that.
Which means that on the free Sorcerer's Lair table I have two entries in that online tournament, my Xbox Live Gamertag of Airborne Gator (for Xbox One and Windows 10 PC using the Microsoft store Pinball FX3 client), and my Steam id of Falkenstein using the Steam Pinball FX3 client, which I used to check on the tournament being available to join from Steam. While I'll miss out on the Steam sales, I'm going to pick up my Pinball FX3 tables from Microsoft since I will get the tables in both the Xbox One client and the Windows 10 PC client that way.
As Mirefox says, I'm just playing my Stately Play friendly games in there since it conveniently will keep our high scores recorded there. The 14 days doesn't quite take us to the end of the month, but the next option was 30 days.