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Invalid Token with request to ssodata

I just upgraded auth0-js from 8.10 to the latest 9.x in a React app using Universal Login. The regular login works fine but when it uses the login widget with the email populated (from the ssodata endpoint) i get an error every time:

error: “invalid_token”
errorDescription: "state does not match."

I’m using the Classic Universal Login.
I went through the v9 migration guide and I can’t find anything. Any suggestions?