Migration assistant replace user account greyed out
good morning
i rang apple this morning regarding my iMac suffering from the spinning rainbow wheel quite a lot recently.
we backed up data, erased the HD and installed High Sierra. I was told to not tick any buttons until I got to the desktop and then use migration assistant with my backup.
I have started the procedure and and got to a user account already exists. There are supposed to be 2 options replace xx on this Mac (which is grey scaled) and won't let me select or keep both user accounts and rename. Having read a few posts on the communities it seems 2 accounts causes confusion.
does anyone know how I can get the replace xx to work? If I have to proceed with new user account bearing in mind this "new" Mac has nothing on it what do I do as I don't want 2 user accounts.
i have tried getting back to apple but I don't know when I will hear back and I am stuck on this page.
thank you
😀
macOS High Sierra (10.13)