Thank you for reaching out to us. As I understand you are looking for information related to SAML & SCIM are supported within Azure China (21Vianet).
Researched on this issue, SAML is not supported in 21Vianet. Reference - https://docs.azure.cn/zh-cn/active-directory/develop/authentication-vs-authorization
SCIM Provisioning also not supported - https://docs.azure.cn/zh-cn/active-directory/fundamentals/auth-sync-overview
Any information related to 21Vianet you can refer to the below links: