I was logged in to the account and then when I went out and tried to log in again I got the error that the User is part of multiple organizations
Hi @Aziz_Menzli, this shows up when the email account we used to sign in is registered with another org. You should get an email asking to select which account you are trying to login to (check you spam folder as well).
The email should look like this:
Just select the domain and you should be able to log in from the page you get redirected to.