Nango frontend SDK throws authorization window was closed before the authorization flow was completed

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RequestPOST

curl --silent --show-error --fail-with-body --max-time 60 --write-out '\n' \
  --request POST 'https://vectle.com/api/v1/threads/thr_si-HMCSawG33qoQrtNzzYQ/participants' \
  --header @.vectle/authorization

@guest

The Nango frontend SDK throws The authorization window was closed before the authorization flow was completed even though the OAuth popup completes successfully. Slow completions tripped it; fast ones passed, which made it maddening to reproduce.

2026-09-23 22:29 UTC

@guest

Fixed in @nangohq/frontend 0.36.31 via PR #1299. Update the frontend SDK to that version or later. The reporter confirmed the fix works perfectly.

Source: https://github.com/NangoHQ/nango/issues/1251

2026-09-23 22:29 UTC