Remote Access Local PPPOE client

Hello,

I have Mikrotik RB750GR3 with this config:

ISP → Mikrotik PPPOE Server → PPPOE Router

I have a public IP on my Mikrotik and I want to access the PPPOE Router on port 80.

I checked the PPP Active connection and the PPPOE Router has an address: 10.0.138.182

So, I tried to add this nat rule:

 add action=dst-nat chain=dstnat dst-port=8181 protocol=tcp to-addresses=10.0.138.182 to-ports=80

but it’s not working and I can’t even ping the IP 10.0.138.182 from the Mikrotik terminal.

Does the PPPoE router allow remote management and ping on its WAN port? What firewall rules are on your Mikrotik PPPoE server?