I am facing the exact same issue when users try to access mapkit map from China (401 response). Were you able to sort out the issue?

P.S GET https://cdn.apple-mapkit.com/ma/bootstrap?apiVersion=2&mkjsVersion=5.76.106&poi=1 with Postman returns 401 not authorized while on VPN connected to China servers (using the signed mapkit token as bearer token), but is getting the ok response not being on VPN.

Is there any feedback on mapkit js possible bugs for China? Thanks in advance, Marko Todorovic