Can't log in to my account in launcher or game but can on the Sims 3 Store

abistasiasims  It should be there anyway on a personal computer; the wording is more for companies with IT departments.

At any rate, try using a new admin Windows account, as a test.  Make it local, as in, don't link it to your Microsoft account or any email address.  Your saves and other user data won't be available, but that can be addressed later if necessary.  For now, this is just a test.