I've got a globally registered app id of type "Public Client" for consumer with multi-tenancy enabled using /common/oauth2/v2.0/-authentication endpoints.
Now using this app id doesn't work for AD tenants in Azure operated by 21Vianet.
There is no documentation I can find which describes this exact use case. Basically create a "public client" app registration in Azure Portal (.com) and use it in login.chinacloudapi.cn. Is there any way this integration works? Registering a company in china is no option.