It’s possible that you are using a deprecated endpoint, but we’d need to see the requests to be sure.
Would you be able to share the code you’re using along with a HAR file (please remove any sensitive details such as passwords) so we can have a closer look at what’s going on?
Please upload both to a cloud storage service (e.g. Google drive), and share the link with us. Feel free to restrict access to the link for only @auth0.com email addresses using Sharelock.io.
Thanks in advance.