Fix UnexpectedValueException

✅ Solution

The UnexpectedValueException in oauth2-client often arises from the OAuth server returning a response in an unexpected format, like HTML instead of JSON. To fix this, inspect the raw response from the OAuth server, identify the actual format, and adjust your code to correctly parse it; this might involve adding error handling or specifying the expected response format in your request, like setting the 'Accept' header to 'application/json'.