Hi @James James
To add external users to Microsoft Teams for customer communication, organizations generally use the "Guest Access" or "External Access" features.
However, Microsoft provides a variety of ways for external people to access Microsoft 365 resources:
For more information, please refer to: https://learn.microsoft.com/en-us/microsoft-365/enterprise/external-guest-access?view=o365-worldwide.
If you want to learn about using guest access and external access to collaborate with people outside your organization, please refer to: https://learn.microsoft.com/en-us/microsoftteams/communicate-with-users-from-other-organizations.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.