hAP ac - forwarding WAN traffic to LAN / port forward

RouterOS Beginner Basics
1

Hi there!
I recently purchased hAP ac. I decided to ask member of this forum to help me, because I am noob atm.
My routeros-mipsbe 6.48, fw updated to latest.

  1. Internet access router provided by inet provider:
    Huawei optical router GPON and few eth. ports, wifi disabled, dhcp server enabled scope 192.168.1.2-.100
    Port forwarding set up for few IP devices from WAN to LAN.

  2. Scondary LAN router Mikrotik hAP ac, all eth ports in one bridge,dual band wifi enabled, dhcp server enabled scope 192.168.1.101.254, dhcp client param set to GW 192.168.1.1, Prim.DNS 192.168.1.1, Sec. DNS: 192.168.1.2.

Issue:
I am unable to access LAN devices from Internet. I tried to disable dhcp srv for provider router, but then I can not add trigger ports and create forward rules.

Thank you for hints, suggestions and all kind of support!

Have a great new year!

Kind Regards George.