The free version can only be used in a private environment - for example if you help friends or relatives in your free time and do not receive any money for it. Commercial use is every usage in a business environment. This means, if you use it at work or support customers and colleagues, it will be commercial usage. Therefore, you are not allowed to use the free version of TeamViewer in any office environments. As soon as one of the PCs participating in a session is connected to a commercial network (office/school/etc.) it is considered commercial use. Also, server use is not supported for free TeamViewer service.
If you feel like you are using it correctly, you will need to submit your inforamtion here and wait for a response from the Product Engineers, https://www.teamviewer.com/en/support/commercial-use-suspected/?_ga=2.226688797.1259688068.1535610848-2133486588.1530254393
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