Team viewer Intune Integration

Hello,
1. We have Team viewer activation for Intune and is currently disabled it.
2.Would like to know if enabling this will incure any licensing cost.
3. If enabled will team viewer be charged per device basis, if yes what is the estimate for using team viewer in 20k devices.
4. what would be the next steps after the licensing, set up guide. and support.
5. setup guide with respect to the technical IT person who is managing or debugging a session using team viewer.
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Thanks,
Naren (**Please do not post personal information**)