Remote Desktop over PPTP issue

I have a PPTP server created with this tutorial:
https://www.bgocloud.com/knowledgebase/32/mikrotik-chr-how-to-setup-pptp-vpn-server.html
I am connecting to the VPN , but I have the following issue:

  • On some of the computers I can not connect to Remote Desktop on Windows Server 2019 host from the remote computer.
    There is a ping to it, and the tracert seems to trace it, but I can not open the shared folders on it, nor I can connect to it’s remote desktop from some of the remote computers.
  • What could causing this issue ?

The router is Mikrotik CRS112-8G-4S-IN, if this maters.