TL;DR

OAuth in Expo returns to your app through a custom scheme like myapp:// .

Three things must agree: scheme in app.json , the redirectTo from makeRedirectUri() , and Supabase's Redirect URLs allowlist.

makeRedirectUri() returns exp://... in Expo Go and myapp://... in a dev build. Allowlist the one you actually use.

Changing scheme needs a rebuild. An OTA update won't do it.

Debug step one: console.log(makeRedirectUri()) on the device.

The setup

app.json :

{ "expo" : { "scheme" : "myapp" } }

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Supabase dashboard, Authentication > URL Configuration > Redirect URLs:

myapp://**

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( * stays inside one path segment, ** matches anything including / .)

The code

npx expo install expo-auth-session expo-web-browser expo-linking

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import { makeRedirectUri } from ' expo-auth-session ' ; import * as QueryParams from ' expo-auth-session/build/QueryParams ' ; import * as…