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.
Had similar issues with MMR while renting here seems ok if you select individual miners but any of the larger power rentals seems to always start stop.