Unable to sign in to new Copilot iPhone app with personal account after migrating from old Copilot app

I have been a happy user of copilot on my pc and on my phone. i use it with a personal m365 subscription. recently, when i went to use the app on my phone, it said I needed to download the new copilot app.  I did.  and now i cannot login to the new app.  it keeps directing me to my business email and when i try to log in using my personal account (which shows i am signed in) it reverts back to the login screen with my business app.  if i use chrome to go to copilot.com on my phone, i only get the option to download the app.  i can't log in.   I am using an iphone.  I spent 2 hours with support via chat and they can't fix it.  I could use some help please.