Add Guests to a Team in Teams
Guests must have a Microsoft 365 work or school account. If the guest doesn’t yet have a Microsoft account associated with their email address, they will be directed to create one for free.
Note: After you add a Guest to a Team, it may take a few hours before they have access.
To add a guest to your team in Teams:
Select Teams
and go to the team in your team list.
Select More options
> Add member.

Enter the guest's email address. Anyone with a business or consumer email account, such as Outlook, Gmail, or others, can join your Team as a guest.
Add your guest's name. Select Edit guest information
and type a friendly name for them. Be sure to take the time to do this now—you’ll need to open a ticket if you'd like to change this later.

Select Add. Guests will receive a welcome email invitation that includes some information about joining Teams.
Sources:
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