Unable to login to Android app

I have just started having a similar(?) problem. I use the SIM on a router for laptop internet access, have done for a few years now . Suddenly, it tells me that there is a reset error and that I have to sign in to the network, I can get to the dashboard, but I cannot get to any other pages. I am in France at the moment. I have 2gB left on my account for roaming, and I bought another 2gB yesterday to cover me if I run out. I can't get on to my Fire tablet either, but my husband has no issues with SMARTY on his laptop. The add-on has been charged for. I have done network troubleshooting which comes up with the same answer. Any ideas. I have started and restarted,. There is no local 5g problem. Nothing has changed except basically a loss of service for me, not my husband.