Log in your network fails with invalid login during device registration

[MariposaCourt]

The error message is pretty straightforward, and so should the resolution be. But it's not.
No matter how I try, my login credentials result in "Invalid Login". I checked and tried all my credentials in Meraki:
Organization admin credentials

Network Admin credentials 
MDM owner credentials

None of those goes through. I did a password change on some like the MDM owner, but it still fails.

Just in case I was misunderstanding something, I tried all my business manager Apple credentials also, to no avail (no surprise there.)

What could I be missing?
Thank you,

[BlakeRichardson]

Authentication should be using the credentials of a user with the relevant access to that Meraki network, if thats not working I would contact support.

A work around would be to disable enrolment authentication and restrict via IP range instead however this does reduce the level of security but if they are company owned devices I can't see this being a big issue. Obviously this won't work if you have users spread all over the place. 

[MariposaCourt]

Thank you, Blake.

I don't have access to support cases, and could this be my issue? I'm thinking the MGM is likely a free tool for entities with an existing MERAKI account/contract. I came just for that tool.

[MariposaCourt]

I take it back, I found support cases in a different location than expected.