Port Forwarding - RDP - Did it correct but still not working

RouterOS Wireless Networking
1

I forwarded port 3389 with the following settings in IP → Firewal → Nat

chain=dstnat dst-port=3389 action=dst-nat protocol=tcp to-address=192.168.1.121 to-port=3389

But putting my router’s external IP address in Remote Desktop still could not connect, even after rebooting the router.

I have the RB951G-2HnD

Any tips?