Mobile:
- Click on ‘More’ at the bottom right
- Click on ‘Teams & People’
- Scroll down to the bottom to the section called ‘People who haven’t joined yet’
- Click on User’s name
- Click Remove from Organization
- Click OK
Web:
1. Go to Teams/Users tab
2. Click Users
3. Find User in User list
4. Click User’s name
5. Click Remove from Organization in profile
6. Click OK