How to auto refresh outlook inbox in chrome web browser?

I prefer to view my business Outlook mail via the Chrome web browser on my MacBook.

I view my personal Gmail account via another tab.

Until recently, my Outlook email used to refresh quite often.

It used to show a red dot on the tab whenever a new email arrived.

However, after I recently had my MacBook Pro fixed, my Outlook mail now NEVER refreshes unless I force it.

I am using Big Sur 11.6

My Gmail is happily behaving as before, and in fact, it has improved, as I now see a number on the tab to indicate how many new emails have arrived in my Primary inbox :)

I have tried getting rid of all my Extensions (as per a suggestion I found online)

Other general internet searches & suggestions have also proved fruitless :(

This is very frustrating.

I trust someone knows how to fix this.

Suggestions are welcome

Thx