Hello Juan Garcia,
The endless boot loop you are experiencing during the initial setup of Microsoft Teams Rooms (MTR) is a well-documented issue that almost invariably stems from the device having an active internet connection during the provisioning phase. When the system attempts to initialize the specialized "Skype" user account and the custom Shell Launcher configuration, an active network connection often triggers Windows Updates or Store updates simultaneously, corrupting the specific kiosk mode parameters required for MTR to launch.
To resolve this, you must perform a clean re-installation using your existing USB media, but critically, you must disconnect the Ethernet cable and ensure the device is completely offline before booting from the USB. Proceed through the entire installation process without a network connection. Do not reconnect the network cable until the system has successfully completed the Windows Out-of-Box Experience (OOBE), rebooted, and fully loaded the Microsoft Teams Rooms "purple" setup screen. Only once the application interface is stable and waiting for your input should you reconnect the LAN cable to proceed with the sign-in and configuration.
If the issue persists even with an offline installation, you need to verify that the specific Windows ISO version matches the requirements of the CreateSrsMedia.ps1 script version you are using. MTR deployments are highly specific regarding the Windows build (e.g., Windows 10 IoT Enterprise 22H2). If you are using a generic consumer ISO or an outdated version of the script, the conversion from install.esd to install.wim or the injection of the Appx packages may fail silently, resulting in the system booting to a standard desktop or looping. Ensure you have downloaded the absolute latest version of the deployment script from the Microsoft Docs repository to ensure compatibility with the ISO hash you are verifying.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
VP