Not possible to use Auth0 when behind ngnix on DigitalOcean

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Hi,
I am looking to use Auth0 on nextJs (SPA) running behind ngnix on digitalOcean so the public port is 80.
If I have a redirect to anything other 3000 I get an invalid redirect-url. Please let me know how to use port 80. If this is not possible I will need to stop attempting to use Auth0