Hi Pongsak385
Just checking that you have gone through all the pre-requirements document Azure Active Directory and Intune requirements:
Ensure that Intune device type enrollment restrictions are set to Allow Windows (MDM) platform for corporate enrollment.
Infrastructure configuration: You must configure your infrastructure to automatically hybrid Azure AD join any devices that domain join to the on-premises Active Directory. This configuration lets them be recognized and managed in the cloud.
Is the vNet ARM or classic? In W365 only supports ARM vNets