I was playing with the toolbox last night it doesn't see the miner ( used a direct eth connection changing my ip on the laptop to the same network address) Mabye needs to be flashed by sd card posted in their telegram about it waiting for a response
Based on what I know, this unit model is not supported by Braiins OS, and even the Vnish firmware doesn't support it.
I don't know if Awesome Miner supports this model unit, but it was supported before. When I checked the awesomeminer site, it seemed they removed the T15 firmware.
So your last hope is to use fan simulator or spoofer if you want to bypass the fan check.