Ian: Thanks for the reply but when I follow your suggestion, I get:
"That Microsoft account (email1[at]gmail.com) doesn't exist. Enter a different account or get a new one. "
If I try to re-create that account, I get:
email1[at]gmail.com
You may already have an account
email1[at]gmail.com is already being used with another Microsoft account. You should sign in with that account.
If I try to create the account anyway, it sends a verification email to the closed account and I'm stuck again.
When I sign in with my main Microsoft account: email2[at]gmail.com, I can't find any indication that my account is "using" the closed account of email1[at]gmail.com.
If I try to change the account to a local account, I get an error message that the account cannot be changed with an error code of 0x80004005.
One thing I don't understand is how the MicrosoftAccount:user in Windows Credentials keeps showing user=email1[at]gmail even when I try to change or delete it. It seems to fill in again at reboot. I assume it is coming from the registry.