I have emailed several providers ... are they all super busy or is my email on some sort of blocked list?

They are all part of the same group.  I can't get a response from them either.  The scheduler is known to block people on a whim.

I did not get a reply from that group, until I used an old Gmail address.  Once I got approved, I switched to my Proton email.
Don't know if that is a thing or not.

I also seem to be blocked from “the group”. Wish I could figure out why.

They’re not currently taking new clients. So if you have seen them before they probably would schedule with you, but at the moment I’m assuming none of them are taking new clients.

At least one on that list is not with the "group" - Tandee... so if thats what is happening to more than one group perhaps you have an issue.

Not sure if youre sending in multiple request at the same time but I was told the schedulers dont like that and wont respond  if to any if you do.  Seems they dont want you to explore options and like the power to suggest who you should see if the girl you are inquiring about is booked or unavailable for any reason. As we all know some place have lots of girls and only 2 rooms