I’ve searched but haven’t seen this specific question asked. Apologies if it has and I missed it.
Based on my research, it appears that as an American, I could either purchase this twin pass online or at a station. If I buy at the station, it will be issued in paper format only. If I purchase online, I’m able to get a mobile version. If purchased online as a non-resident, the DBhan site (already registered snd logged in) redirects to Eurorail site. Further, the mobile pass purchased can not be added to the DB Navigator app. It may be possible to add it to the Eurorail app.
A) for those of you in the know, could you confirm my understanding or clarify if incorrect, and
B) recommend the better course of action
incidentally the Eurorail site make the charge in USD and its price is $20-40 higher than the USD equivalent of the DBahn pricing chart in Euros, but that could be an undisclosed including agency fee or currency rate profit differential.