When you create a Teams meeting invitation it looks pretty basic:
I like graphics and design. And I like taking advantages of all features, such as adding company branding whenever I can.
Go to https://admin.teams.microsoft.com/ and expand Meetings and choose Meetings settings.
Add the URL to your logo – and add link to legal information and help section if preferred:
Be aware that it might take up to 24 hours before meeting settings are updated in Outlook. So after a while this is how it looks for me now: