Branch A and B offices have a site-to-site VPN connection, everything is OK, branch A PCs can access branch B office server files and folders if A branch PC has mapped the network drive under the Windows 10, e.g. H drive.
Recently, we have enabled the client-to-site VPN connection to branch A office so that staff can access branch A office server files if our colleagues will be worked from home, staff laptop can access branch A office files but staff laptop cannot access branch B office file server.
If use ping command:
laptop can ping branch A network (192.168.1.x) but laptop cannot ping branch B network (192.168.2.x)
I have tried to add a static route on the laptop Windows but it still doesn't work.
How a laptop can access both branch A and B server files even both offices are using site-to-site VPN (diagram attached)
Branch A office using FortiGate 61F firewall.
Appreciate that if someone can help.