So I've been using QB Desktop Pro for years and I have had the same issue with the primary admin name not changing when it asks me to log into my Intuit account for 2 years.  I submitted all the paperwork requested, and they changed it in a few places.  BUT today I finally got Noel from QB Support to SOLVE this problem.  It took us 2 days but here is the solution. . . press F2 when you have your QB file open and up ready to use.  Then look on the right hand side under Intuit Account Information.  If the primary admin email is incorrect and you still need to get it switched to the new primary admin, here is how you fix this problem.  Close the F2 window that opened up.  Then go to "Help" in the top of your QB screen (next to Window).  Drop down to "Reset Intuit ID Settings".  Type Yes in the open field and then hit "Reset".  I've already done this so I can't do it again to tell you what to do now but I'm pretty sure you just delete the old email and then enter the one you want to be the new primary admin.  Once you have saved it, go back and hit F2 again and see if the new primary admin name is now the correct email address.  You may need to sign in to the Intuit account before it shows up.  To do that got to "Company" at the top, drop down to My Company.  Then in the top right corner click "Sign In".  Use your Intuit account information not your QB log in information.  If they are the same, then that's easier.  That should fix it.  Big thanks to Noel in support who finally got me a fix to this problem I've had the past few years that no one else could help me with.