solve M/S 365 Outlook problem please

since November 2023 update, I have lost most of Outlook options for customisation.

I am using a Laptop.

I have confirmed that I have an active subscription to Microsoft 365 by going into file etc.

I have had assistance from others and paid a “technician” to no avail ☹

Technician set up an Outlook email address, but it will not work.

when I try to open “outlook” I receive the message below

then when I click next it logs on but only allows me to access my Bigpond email address.

I have nothing in the permission box for the outlook email address  ☹

It is also sending emails that previously came through my in box to the junk folder

I have tried to access the “rule” option but comes up with

Any solutions?????