I wrote some python and generated all hashes in under a second locally:
from hashlib import sha256
phone="+18001234567"
expiry= challenge.split(".")[1]
start = time.time();
for i in range(999999):
sha256(f"{phone}{i:06d}{expiry}".encode('utf-8'))
print(time.time() - start)
> 0.3987562656402588
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I wrote some python and generated all hashes in under a second locally: