Asus port forward

[nowuckinfurries]

Guys and gals,

For some reason I cannot get my Asus Rt-ac87u to port forward. I have done port forwarding with no issues on previous devices but I can't even get an open port on Asus. It is configured correctly and I have tried both Asus and Merlin Firmware but still no joy. anyone have an Asus with same issue?

[nowuckinfurries]

Now spent 3 days checking and checking and following every guide known to mankind. still no joy.