Hi @gerald.talton,
Welcome to the Auth0 Community!
I understand that you encountered issues when requesting the Management API Search users by Email endpoint.
First, could you please check if the access token has the correct claims when decoded using jwt.io?
And could you please make sure that your application is authorized to call the Management API by checking the Management API settings?
To do so, please navigate to your Auth0 Dashboard > Applications > APIs > Auth0 Management API > Machine to Machine Applications. On there, make sure that your application is authorized and expand the permissions and select all the required scopes.
Once that is complete, you can get an access token to call the Management API Search users by Email endpoint.
Lastly, you may find our Get Management API Access Tokens for Production documentation useful.
Please let me know how this goes for you.
Thank you.