I have not been able to resolve the problem between Nextdoor and Edge. I now log on using Firefox.
I can get to the Nextdoor.com website in Microsoft Edge if I open it up in an InPrivate window. I have not tried logging in to the nextdoor.com website this way since I don't remember my password, but a non-inprivate attempt just gives me a 394 error without opening up the webpage at all.
I can also get to nextdoor.com on the same computer under a different profile without having to go into an InPrivate window.