Downloaded LP from the MS store. Installed it in Edge and is seems to be running.
LP wants me to set up an account. I enter my current LP user name and PSW that I use for my FF install. LP rejects my information saying my user name is already in use.
I have no interest in creating a second LP account. Among other things, I feel sure that will mean I can't see my existing database. That would simply not be acceptable. It is bad enough I am having to use Edge edge for certain really stupidly built commercial sites.