Having trouble connecting to Alexa account

Hi - I'm trying to do the Alexa Skill tutorial. My Amazon developer account is active and it has one (old) skill in it that I started before and abandoned. I get a popup "Click 'Allow' to Sign-In to MIT App Inventor." and I click Allow. The popup closes and I'm back at the AppInventor screen but the testing still says "Login to Amazon."

Chrome 112.0.5615.121, MacOS 13.3.1.

What else might it be? thanks for any help.