Unable to multibox in d3

Hello every attempt i make to multibox will not allow me to do so
when i log in with one account (not using the launcher btw) it disconnects the previous player, this is all one account

every attempt ive made has been unsuccessfull, has blizzard blocked multiboxing on one account or do i need seperate accounts, cause every time i log in with one of my characters on same account it disconnects the previous one i logged in on and cant log them all only 1

please help

btw just a little info i names my characters in isboxer char1 char2 char3 and char4, do they need to be the exact name of the character im logging in as?

[MiRai]

has blizzard blocked multiboxing on one account

Blizzard has never allowed multiboxing from one account.

do i need seperate accounts

Yes, you need multiple Battle.net accounts, each with their own D3 license.

ok tyvm