Well, OK. Thanks. That explains the problem. Now, I wonder why Edge doesn't support Avast Passwords.
In a word probably 'Microsoft', they can be a real pain, not very flexible at all. They aren't helping their own cause (or existing users) when they prevent such things.
I never really liked IE and hasn't changed with the release of Edge, I have never used Edge on my win10 system.
I thought rumour out of control that Edge was going to be abandoned in favour of a Chromium based browser. If that were to happen it could mean much greater flexibility for users. As Bob now effectively confirms.