MS60 WI FI ROUTER WILL NOT ALLOW IP CAMERA CONNECTION OUTSIDE THE LAN

I have an Amcrest IP Camera connected to the lan via wifi.  The ports are open to the camera verified by a port check.  Connection to the camera is by proprietary app from Amcrest.  The connection works perfectly inside the lan when my mobile device is connected to the lan via wifi, but will not connect when I connect mobile device to the cell network.  I have changed routers, updated firmware for both MR60 and the IP camera.  Forced connection to the MR60 via 2.5 Gig connection by splitting the wifi signals on the Mesh.  I have 200 mb down and 10 mb up from WAN.  ISP is Spectrum, modem is the same that I used to get a connection from outside the lan previously.  Any ideas on how to proceed would be greatly appreciated.

Thanks,

Jack

BTW, I couldn't put content in the body of the original post using MS Edge Browser, had to change to Chrome, thanks for your understanding.