Windows 10: Windows 10 won't sign in after I've added another account as the admin

Here's a brief timeline of what happened:I created 3 new Microsoft accounts all using Gmails for my family Account X is the Admin of the group Y & Z are the Child's account; with X being me and the rests being family membersI signed into Y's Windows 10 computer, removed him as admin so that the Family Safety features would work properly and then added me as the admin of the Computer with both Y & Z have the permission to Sign In as Standard UsersBefore all of these the Computer was using a local Account with a password settedBut now with all the new accounts signed in I was prompted to

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How to change admin user account name?

ah so main admin account is 'wizzle' which is what I am currently on
I make another account called 'wizzle2' (with admin rights)
I sign out of 'wizzle' and sign into 'wizzle2'.
And once signed into 'wizzle2', then I do the command prompt step and find the SID for 'wizzle' that is listed and go from there?

 

Admin account and my account on Windows 10 sign-in

When I boot up my Windows 10 desktop, the sign-in screen at the center of the display says, "Administrator" and below that it says that the password is incorrect.

In the bottom left-hand corner there are two listings: "admin" and "myname." I click on "myname" and then at the center of the screen is says my name and below that there's a blank box to enter the password. I enter my Windows password and all is well.

But I don't want to have to do this every time I boot up the computer. I want it to display my name right away and not "Administrator" which I did not create. The myname account is an administrator account.

I've gone into Settings and Accounts and there is only the "myname" account listed. I don't see any "Administrator" or "admin" account.

Some posts have suggested going into Computer Management and clicking on "Groups and Users" or "Users," but there are no such listings under Computer Management in Windows 10.

Any help is appreciated. Thanks.

 

Mail app only working when signed in under Admin account


Upgraded from Windows 7 about two months ago, but this just started a few days ago.
Tried to read my email and found that I could not use the mail app when signed in under my User account. (previously worked fine.)
If I sign in under my Admin account, the mail app works normally.
I've tried deleting and reinstalling the mail/calendar app, and now I don't even have the icons to launch them- not even listed on the start menu, except when using the Admin account.
Is there another way to launch or repair the app?
Any suggested fixes?
Don't want to keep having to sign in as Admin just to read my email.
Thanks!