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Fixing OAuthAccountNotLinked Error in NextAuth.js

Fixing OAuthAccountNotLinked Error in NextAuth.js

S

By Suvojit Mondal

Published: November 21, 2025•4 min read

Table of contents

The Problem
Why NextAuth Blocks This
The Solution
What Didn't Work
Attempt 1: Global Configuration
Attempt 2: Route Handler
What Actually Worked
Extending the Type Definition
Custom Adapter for Better Account Linking
Dependencies Issue
When Is This Safe?
Complete Working Example
Testing
Summary

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