How to add external members to your Sharepoint Site

1. Go to Site Permissions

2. Click on Advance Permissions

3. Select Team Site Members

4. Select New > Add Users

5. Provide the member email address and click on Share

6. The recipient will receive the invitation email. 

7. In this example, we intenationally use a gmail email address for demonstration.
If the recipient does not have a email address that belongs to Microsoft, the recipient MUST create an account by clicking on "Create a Microsoft Account. It's quick and easy"

8. If the recipient has an email address that belongs to Microsoft OR has completed creating their Microsoft account, then go back to the email and click on the invite again.

9. This time, click on Microsoft Account and login with their account. 

10. Upon successful login, the teams site will show up.

11. Since the external member was invited as Teams Site Members, it would receive the same permissions which includes VIEW / EDIT / DELETE.