M1100 Vodafone Greek no internet

M1100 - 100 Nighthawk M1

Vodafone Greece sends an interactive message direct to the screen (of a smartphone, tablet e.g.) to confirm the SIM card, every first time it is used in a device. On my smartphone everything works fine.

When I try to use the SIM card in my Nighthawk M1100, I use the WIFI of the router to connect with my laptop via https to the router. The APN ist correct, Vodafone Greece is shown, but there is not internet connection. This WiFi needs an action to be performed on the site of Vodafone (to confirm the SIM). But as there is no internet available on the routers WiFi yet, I cannot connect to Vodafone's site on the internet ...

When I change to a different WiFi on my laptop to connect the internet, the message of the routers WiFi to perform the action is gone.

It seems there is no solution to activate the internet on the internet with an WiFi connection with no internet?

What do I not understand?