outlook zoom plug-in for scheduling meetings no longer works

I have two issues:

1) the meeting scheduler zoom plug-in in outlook no longer works

2) I can't log in with username and password and I can't change the password

To schedule a meeting, I now have to open zoom workplace via the icon on the desk top (no problems with that, so I don't know why I can't log in the other way) and create a new meeting from the home page.

I'd be grateful for any advice.  Many thanks.