Erase Assistant thinks i'm still logged in to old Apple iD

I'm having a problem very similar to this one:

Erase assistant problem - Apple Community

I have old laptop I want to erase.

I have logged-out of my Apple ID.

If I open Find My, it says "Sign in to access devices" so it thinks I have signed-out as well.

But, when I run Erase Assistant ("Erase All Content and Settings...") it throws up a dialog that says "Sign Out of Find My" and prompts me for a password for an old Apple ID.

I changed the ID (email address) of my Apple ID, I didn't create a second one. So the name of the Apple ID is the old email of my current account. But if I enter my current Apple ID password, or what I remember as the previous one, neither works. So it's trying to get me to sign in to an Apple ID that effectively doesn't exist anymore (because I changed the name).

I cancelled Erase Assistant and re-signed-in to my Apple ID, and it still shows "Find My" is signed out.

How do I get past this?