"already a subscriber?" does not work

This is a new install of debian 13 trixie. I have a subscription to mozillavpn. It was working on a previous install of debian. I use synaptic to install flatpak. I use flatpak to install warehouse. I use warehouse to install mozillavpn. Once installed I highlight the package mozilla vpn in warehouse then click open. A mozillavpn icon appears in the taskbar. Also a window that is shaped like a cell phone open up. This window has a button to "sign up", also it has a link to "already a subscriber?". I click the "already a subscriber" link. It changes to a page that says "waiting for sign in and subscription confirmation..." with a rotating circle and a button to cancel. It also opens a separate browser to a start page. I wait awhile but nothing happens. I change the browser page to my mozilla account page at "https://accounts.firefox.com/settings" Nothing happens. There's a button on the account page to "connect a device" but I don't know what to do with it. Under the heading "Everything you are using and signed into." it has 2 entries: "Firefox 153, Linux" and "Mozilla Support". Both entries have a "sign out" button. Back at the mozilla vpn cell phone shaped window the spinner just spins and nothing else. So I'm stuck. I click cancel and it goes back to the "sign up' / "already a subscriber?" page. From the icon in the taskbar I click quit and both the window and the icon go away. Everything seems to working but I am not registering as a subscriber. I've tried this several times over the course of 2 days. It's always the same.