Ah, thank you, this was my problem too!
For those that might find this in the future, enrolling a Samsung device was stuck at "please wait while we retrieve your enterprise settings". Turns out, as noted above, the problem was in:
Devices & Users > Android > Intelligent Hub Settings
Under Samsung KNOX, "Enable Containers" was Enabled. Disable that and started enrollment over, and it worked as expected.
Thanks Chris_USS!