When you get to the MS autheticator page within pulse secure that sys they have sent a code, choose 'Sign in another way'. At the next window choose 'Cancel', then the next window will give the option to choose another account ... View more

When pulse secure gets to the authenticator page with the wrong accout details, chose 'sign in another way'. From the new window choose 'cancel', then in the next window you will have the option to 'choose another account.' Hope this helps. ... View more