Hi @tanner1,
Welcome to the Auth0 Community!
I understand that you have been encountering problems with updating your user’s email address.
After testing this myself, I was able to reproduce your error when using an invalid connection name. I was also able to successfully update the user’s email when using a valid connection name.
Given that, I believe that the source of the issue has to do with the value you used for your connection property. I recommend that you double-check that you are using a valid connection name that exists on your tenant.
By default, you should have a Username-Password-Authentication connection which you can create a test user and test it out to verify.
Please let me know if there’s anything else I can do to help.
Thank you.