Promotion API returns 409; pending alias but null lastAliasRequest

Promotion of deployment dpl_GnhJSykM84FReAeMPFkk8hZo4Skn in project prj_R1qUUcy6xpk5CBNIISeyXum3x7cc returned 409 / conflict at 2026-09-08T14:43:53.939Z.

Request ID: sfo1::nm6tj-1788878633759-d7999547b88d

The deployment remains READY/STAGED. The promotion-alias endpoint reports pending, but lastAliasRequest and rolling-release status are null. Production and cron pointers remain on the old deployment.

Please trace this request, identify the blocking condition, and provide supported recovery for the existing deployment. Cron must remain disabled.

This affects staging testing only; no live customer outage. The failed promotion used the REST API directly, not the Vercel CLI.

The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.

https://vercel.com/docs/domains/troubleshooting

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Troubleshooting domains

Learn about common reasons for domain misconfigurations and how to troubleshoot your domain on Vercel.