@James Chan_110, Thanks for posting in Q&A. Based on my researching, Azure AD Workplace Join is an older method of joining devices to Azure AD, while Hybrid Join is a newer and more feature-rich method. Hybrid Join is recommended for organizations with existing on-premises Active Directory domains. If you have new, refurbished, or refreshed Windows devices that you're provisioning and enrolling, then Azure AD join is recommended. Azure AD join is the default option for new and reset endpoints. If you have existing endpoints that are joined to an on-premises AD domain, including hybrid Azure AD joined, then hybrid Azure AD join is recommended. Devices get a cloud identity and can use cloud services that require a cloud identity.
Regarding access to internal resources, both Azure AD Workplace Join and Hybrid Join can be used to access on-premises resources. Azure AD Workplace Join can be used to access on-premises resources, but it is recommended to use Hybrid Join for organizations with existing on-premises Active Directory domains. Hybrid Join endpoints require a line-of-sight to the on-premises AD domain controller for initial sign-in and to change passwords. If the domain is down or is unavailable, then users could be blocked from signing in to their endpoints.
Hope the above information can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.