Currently it is not possible to deploy Teams without network. The following are the prerequisites for deploying Teams you should check:
- Do all premises have internet access (to connect to Microsoft 365 or Office 365)?
- Do you have a verified domain for Microsoft 365 or Office 365 (for example, contoso.com)?
- Does your organization have Exchange Online and SharePoint Online deployed?
Meanwhile, to get this feature more quickly, we recommend you give the feedback in Teams UserVoice. Many features of our current products are designed and upgraded based on customers’ feedback. With requirements like this increase, the problem may well be released in the future. Thanks for your understanding and support.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.