Hi Xavier,
My name is Umar and I'd be happy to help you out with your question.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
Creating a group chat in Microsoft Teams is similar to starting a one-on-one chat. Here's how to do it:
Open the Microsoft Teams application.
Click on the "Chat" tab in the left sidebar.
At the top of the screen, you will see a "New Chat" button. Click on it to create a new chat.
In the "To" section, enter the names, email addresses, or phone numbers of the people you want to include in the group chat.
Type a message in the chat box and press Enter to finish creating the group chat.
For specific instructions on the items listed above, kindly check the link below.
https://support.microsoft.com/office/556d9323-75f4-4cbe-ba49-e65d7d8d53a8
https://support.microsoft.com/office/297a3fd1-9316-4d9e-8f96-4849716f9a27
I hope this information is helpful. Please let me know if you have any other questions.
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Best Regards,
Umar Majeed