Problem adding advisor

I need to give my  accountant access to my file and sent an invitation as an advisor. The accountant said they didnt receive the invitation so I checked the invite and saw that somehow the email had been curtailed ie the full email wasnt there so I deleted the invite. However when I try and do another advisor invitation in Essentials. (It is no longer visible in my list of advisors).  I get an error "There is already a user with this email. Enter a different email."

What do I do? 

Also my previous advisor is coming up as an owner! So I am an owner and so are they. Seems to have happened when essentials was upgraded. They need to be removed.