Additional sign-in or account-related issues within Microsoft Teams for business
Hi Mohamed,
I'm Nik, an independent advisor here to assist you with this.
Unfortunately, it is not possible. You'd need to enable Microsoft 365 business with Teams service licence to allow the user access to your tenant.
You'd require Microsoft 365 business licence for each member of your organisation.
If you're looking for trail MS Teams licence then you could check Teams Exploratory license: https://docs.microsoft.com/en-us/microsoftteams...
When you have a free organisation using MS Teams free licence, it is a completely different tenant that will not interact with your Office 365 business tenant.
Regards
Nik