User CALS for cloud server

We are creating a cloud server for a customer who will be accessing it via a UNC path/mapping the path for them.  they will use Active Directory on the cloud server to authenticate them to the mapped drive or data path.  can someone confirm if User CALS are needed for this method of use?

the PC's themselves wont be domain joined to it but their will be active directory on their with a domain.  they also wont RDPing to it.
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CRL ltdAsked:
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Shaun VermaakTechnical SpecialistCommented:
On what cloud?
CRL ltdAuthor Commented:
its going to be a hosted VPS cloud server 2016 with Fasthost
Shaun VermaakTechnical SpecialistCommented:
Yes, for each user
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CALs

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