Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hello Deankingdk,
Thanks for your post in Microsoft community. Guest access is included with all Office 365 Business Premium, Office 365 Enterprise, and Office 365 Education subscriptions. No additional Office 365 license is necessary. Teams doesn't restrict the number of guests you can add. However, the total number of guests that can be added to your tenant is based on what your Azure AD licensing allows - usually 5 guests per licensed user. For more information, see Azure AD B2B collaboration licensing.
With Azure Active Directory (Azure AD) business-to-business (B2B) collaboration, you can invite External Users (or "guest users") to use your paid Azure AD services. Some features are free, but for any paid Azure AD features, you can invite up to five guest users for each Azure AD edition license that you own for an employee or a non-guest user in your tenant.
You may compare Azure Active Directory (AD) pricing information to find below information via https://azure.microsoft.com/en-us/pricing/details/active-directory/
Thanks and regards,
Ankita Vaidya