The Microsoft 365 admin must grant delegate access before you can add and use a shared mailbox from your Outlook account. If you have access to a shared mailbox from your organization, you’ll ...

Tick the box beside the account name of the person you ... Here's how you can change the default browser within Outlook.

Then follow steps 3-6 above. The user that has been given access will now need to add this to their Outlook account, they will need to follow the steps below: 1. Launch Outlook.