FortiEMS - ActiveDirectory Home Folders access/mount

There is a environment like below:

1. AD located in the cloud
2. EMS serwer located in the cloud
3. On the edge of the cloud, there is a FG virtual machine
4. In the branch, there is a FG and Fortiswitch
5. There is a VPN IPSEC tunnel between the branch and the cloud (from FG located in the branch to FG Virtual Machine, located in the cloud)

Firewall rules contains ZTNA tags in the branch FG and in the cloud FG; checking the traffic which goes to the machines located in the cloud.

1. user connects computer to the fortiswitch in the branch
2. port in the fortiswitch is in the NAC mode
3. in the beginning; this computer first goes to the "onboarding" vlan; after two or three minutes later; computer has acces to company sites.

Each user has own home folder which access path is declared in te user AD account setting. But there is a problem. How to mount user home folder if the EMS server needs a few minutes before it authenticates the machine? Is there any solution?