Cannot sync Country when connecting greenfields D365 BC <-> Dataverse (and onto D365 Sales)

Hey, sorry for the very newbie question, but everyone has to start somewhere!

I get this cryptic incantation when trying to connect an essentially greenfields D365 BC (a small bit of progress through assisted setup) and a similarly vanilla D365 Sales instance, using the very latest updates on 2025 wave 2 (like I've applied this weeks coming update and any and all of the background app updates etc afaik is totally up-to-date at 28 Sep 2025 - maybe this is new and because we're living bleeding edge, may possibly be a heads up for someone out there, I really dont know.

Cannot sync Country when connecting greenfields D365 BC <-> Dataverse (and onto D365 Sales) - Business Process Error: Choice member name to[o] long. dyn365bc_countryregionaddressformat_v2_0.City_x002B_County_x002B_Post_x0020_Code_x0020__x0028_no_x0020_commax0029

When performing the Dataverse connection and trying to enable all of the available fields, the above error message appears, and no matter what the dropdown is set to, the choice in the error doesn't seem to change, in PowerApps, in Choices, is no entries for 'dyn365bc_country' (but plenty of others), has been setting up for a day and a half half sync'ed, country not published nor trying, but seemingly leaving some of the rest in limbo.

I asked CoPilot, ChatGPT et al and poked around without coming up with anything, didnt pass the google test, thought maybe an MS Call, but we try not to take the mickey and at least try first