The Google collaboration environment does not allow documents, folders, and other resources to be shared restrictively (when not done through a public link) with accounts that are not present on any Google platform.
For companies that exclusively use the Microsoft 365 Business environment, the most efficient solution for companies with fewer than 100 users is that, for users who need to receive any sharing, they register for Google Workspace Essentials Starter. This account has no costs and can be created at https://workspace.google.com/essentials/
Points of attention:
- Since there is a limit of free accounts available per domain, only register your account when necessary;
- This activation must be done by the user themselves; it cannot be done by third parties as it depends on the user's own authentication in the Google environment;
- It is not possible to delete third-party accounts; if the number of accounts exceeds the limit, even with users leaving the company, the company will need to move to the paid plan to be able to have new accounts on Google.