Public IP forwarded to Mikrotik Router for WireGuard use

Hi,
I have a MK router wAP R ac behind ISP router that I want to run as Wireguard server and create a tunnel with my mobile, something like this:

(MK wAP R ) .2 —192.168.1.0— .1 (ISP Router)—ADSL----(Internet)–LTE ipv4— (Mobile phone with Wireguard APP)

I get Public IP on ISP router (not static) and I get it from whatismyip.com. Setting everything according to standard when it comes to Wireguard, but the mobile is not getting to Wireguard server and viceversa. I believe the problem is my Port Forwarding. Can you help me to figure how the port forwarding suppose to look? Mine is actually looking like this on ISP router. Inner port: 12345 - same as listening port on wireguard server, outer port: 12345 - basically the same. This doesn’t work and I’m pretty sure that port forwarding is the issue as I can ping the ISP router public IP from my mobile.

Many thanks for any help in the matter.

Did you also allow input for that port on your wAP R ?