Can't connect Claude or ChatGPT

Updated November 1, 2026

How to fix the most common connection problems.

"Unknown client" or "Couldn't connect"

Shape lost the registration your AI app saved the first time it connected. Trying again won’t help. Remove the Shape connector, in ChatGPT under Settings → Apps & Connectors, then add it again. This is a one-time fix: it stays registered once you press Allow.

"Subscription required"

A workspace blocks it

On a ChatGPT Business, Enterprise or Edu workspace, an admin may have to allow Shape Calendar first.

New tools don't show up

Claude keeps a list of a connector’s tools. Open the Shape connector’s settings and refresh the tools list.

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