Hi @Finnbogi,
Welcome, and thank you for reaching out to the TeamViewer Community! 😊
To start with, some quick check-ups will help make sure your device is compatible with TeamViewer.
Please take a moment to review whether TeamViewer remote control is supported for your Android manufacturer by visiting this article: Supported manufacturers for remotely controlling Android devices
In terms of supported operating systems, TeamViewer Host requires Android OS version 5.1 or higher—so it looks like your device is in good shape there. More details can be found here: Supported operating systems for TeamViewer
If your device’s manufacturer is supported, may I ask if you're encountering any error messages? If so, sharing a screenshot would be super helpful!
Hoping you get back to us soon😀
Chisa