Hi there, we are trying to use auth0.js for login. With Chrome it’s not a problem, but Firefox or Chrome incognito mode yields No verifier returned from client. Here is our simple test setup: index.html: <html> <head> <script src="https://cdn.auth0.com/js/auth0/9.19.0/auth0.min.js"></scrip…

Hi @sabina96clerk , and thank you for bringing this subject back to light so we can provide a solution! The root cause of the “No verifier returned from client” error is that the method uses auth.login() with a username and password and relies on cross-origin authentication using third-party cookies.…

Error: No verifier returned from client

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sabina96clerk August 4, 2025, 12:30pm 4

Did you have a fix on this issue?

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Error: No verifier returned from client

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