Amcrest app not working with P2P remotely

[Nightcast]

So I have a Honeywell NVR with 4 honeywell cams and 2 amcrest cams. When I add the NVR to the Amcrest app connected to my local network it adds just fine and all the cameras load. When I disconnect from the wifi and I'm on LTE all the cameras wont load, just says Failed to connect.
This same setup will work on gDMSS Plus without an issue it's just a little slower to load everything and thats the reason I prefer the Amcrest app.

Does anyone have this issue or know why it might be happening? or a suggestion on a better app for Android?

 

[jack7]

P2P is typically vendor specific. The Amcrest P2P server will only work with Amcrest software and Amcrest devices. But Amcrest and Honeywell are Dahua OEM companies, so perhaps in some cases, some different vendors P2P software and devices will work together.
Instead of P2P, you could try a VPN. See
VPN Primer for Noobs