Since the VIA code for the K17 Pro is still awaiting approval from Github, it is not yet automatically recognized, so you will need to manually download and import the K17 Pro keymap.
Please download the keymap JSON file below. Connect your keyboard and device with the provided cable, and toggle the switch to cable mode. Open VIA, click on the "Show Design tab" on the "Settings" tab, and drag the JSON file into the “Design” tab on VIA to get the K17 Pro keymap working on VIA.
K17 Pro Keymap JSON Files