SmartLink test fails

Hi, thanks for taking your time to solve my issue.
I had tested different modems from different QTH and internet providers, all with the sane results to my dismay, a red dot when testing SmartLink.
At my QTH use a 600/300 Mbs Vodafone router where are connected via RJ45 my home appliances including my Win10PC and FLEX-6400 radio for initial testing, now is setup at my remote QTH
At the remote ( far side ) my provider is also Vodafone but via LTE modem 4G/5G at an avg speed of 100/50 Mbs, connected to a TpLink 16x port Gigabit Switch, where are connected a Win10 PC, remotely controlled using a subscription to RemotePC, fiscally my FLEX-6400, CCTV cams, Rotator systems, automation to watering my crops as this site is located in a rural property, 4K TV, all working flawlessly but my FLEX-6400
On all my PCs obviously are running Smart SDR V3.5.9, DAX same V, CAT same V, all properly registered using my FR account. Normally I use my iPad running Smart SDR for iOS when not at home.
Respect the previous reply if I’m sure to open ports, what ports are you referring to? I registered DAX but nobody ask me to open ports, as My network settings are selected to AUTO.
Appreciate your answers

Hi Mike, nice you take my issue
My IP Address is:

IPv4: ? 62.101.164.189
IPv6: ? Not detected
My IP Information:
ISP: Vodafone Ono S.A.
City: Tarragona
Region: Catalunya
Country: Spain

I ignore even what is an uPNP, sorry. At the Home side is a Vodafone branded model Technicolor_TC7230

and at the remote side I'm using Mercusys - MB110-4G, Router 4G SIM, LTE CAT4, Wi-Fi 300Mbps connected to a 16 port Switch. The radio site is here at the remote side.

Yes I followed SmartLink Quick Start Guide for SmartSDR for Windows to my best knowledge- I pressed the PTT mic on local SmartLink pane, then it returned -Configured for SmartLink- and below Network settings , Automatic in blue, and Test button return me always red dot