MRR states it's an issue with the rented miners not working with ASICBOOST I'm not sure what the issue is I do not think this pool requires ASICBOOST but that is what they tried to say.
They are full of it, their system just can't handle the connection. Last time I rented from them, about 2 years a go, they had the same exact issues. A rental would continuously start and stop. Apparently it had something to do with their system requiring a specific difficulty range and couldn't handle the automatic difficulty adjustment of this pool.