Duplicate BP_RMC_BuyerRegion into your game Content folder and place the duplicate in your existing level.
From your existing controller or widget, keep a reference to that placed actor. Call Start Buyer Navigation when the owning local PlayerController is ready. Wire that exact controller into Owning Player.
Branch on Return Value. On true continue to your map or waypoint input. On false show Failure and retry with the correct controller. Compile and save your duplicate.
Expected result: The owning controller resolves this local player’s navigation subsystem; missing ownership returns false with useful failure text.
Open your duplicated BP_RMC_BuyerRegion. In Components select MapSource, then open Details.
Choose your north-up Overview Texture. Set World Center and World Extent as XY half extents in centimeters; clear Use Owner Location as Center when you need a fixed center.
Keep Active enabled and choose a priority that makes this the intended source. Compile and save; test center and corner UV projections in Play.
Expected result: The captured shipped defaults have no overview assigned and use owner location as center. This image is configuration evidence; buyer-image rendering remains a separate check.