Firebase Reset Password Page Mode invalid

I have added a password rest to flotterflow following the doc here:

https://docs.flutterflow.io/data-and-backend/firebase/authentication/password-resets

This sends a reset password link.

When clicking the link it leads to an error page with a box that says:

"Error encountered

The selected page mode is invalid."

I have googled for an answer unsuccessfully. I have also tried sending the password reset directly from Firebase which sends the email but leads to the same error message. I have a default location in Firebase as europe (I am based in London).

I cannot see what the issue is?

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