Cannot add shared mailbox to outlook

- Cannot add shared mailbox to outlook mobile app
- Cannot add shared mailbox to outlook web
- Cannot add shared mailbox to outlook mac
- Cannot add shared mailbox to outlook android
- Cannot add shared mailbox to outlook greyed out
- Cannot add shared mailbox to outlook mobile
- Cannot add shared mailbox to new outlook
- Add shared mailbox to outlook name cannot be resolved
- Cannot add shared mailbox in outlook add button is greyed out
- New outlook cannot add shared mailbox to favorites