I put together a small miner on ESP32, the hashrate is up to 100 kilohash per second in total.
That's a total waste of time anything less than 300-500GH/S is pointless, even that hash rate is at the lower limit these days.
100KH/S is exactly why your device doesn't register on the pool, its way too slow to be of any use.
Your chance of finding a block is 1 in 123482878321 years!