Hello,
As of now, Adaxes components can only be installed on computers joined to an on-premises AD domain. There are no plans to change that in the near future. As an option, you can roll out a placeholder on-premises Active Directory domain, join a computer to it, and install Adaxes on the domain-joined computer. Then you can register your Microsoft Entra domain using an application account and manage cloud-only objects in Adaxes. The placeholder domain can reside in Microsoft Entra Domain Services, not only in your on-premises environment.