I was unsuccessful with the suggestions above in my environment. However, the automatic install did work correctly the first time (In it’s own directory structure.).
I resolved the problem by placing the email request in an ‘api’ using Next’s ‘route.js’. Putting the outbound request in a server object gave me a working model to build from. I’m not sure how it would work in the suggested configuration but CORS was another factor I found needed to be contended with and the server side request skirted the problem. I also backed off the version of Next to 13.5.6. I was looking at comments out of this series: renderToReadableStream not found in react-dom/server · Issue #868 · resend/react-email · GitHub.