RS4 Avant Sim Card Slot

[MDallimore70]

Hi there,
Completely new here, but wondered, I'm trying to gain access to my Vodafone sim in my 2018 RS4 Avant via the slot in the glovebox. All goes well and I can see the connection on the MMI screen but then I'm unable to get access to anything, including AudiConnect or the internet via the WiFi hotspot, despite the connection manager telling me there's a good signal and I'm connected.
Any help will be really appreciated or if there's another thread for this discussion and possible solution to point me in that direction please?
Thanks in advance,
Mark