Whoever supports that Horizon deployment should be your first point of contact.
I have reported your thread so that a moderator can move it to the area of VMTN for Horizon.
Apparently VMWare Horizon on some Macbooks fills the username field with invisible characters which is why the username is always wrong. The only solution is control-all delete before entering the username. You guys were very helpful, thank you.
To isolate the issue, disable 2FA and then login using Single Factor ( Windows Username and Password) and check if the same username and password is working or not.
Also if there are any pre-login banner set on the Horizon Global settings, try to disable it and check as well.