Unclear What puts a session-owner hold in place is not shown, so it is unclear when this error would appear.
What
When you are not using an API key, Claude Code now checks one more thing before it sets up its connection to the API. If a session-owner hold is in place, it stops with an error whose reason is session_owner. This sits alongside the existing check for subscribers, which was the only check that could stop it before.
Why
This could block requests to the API in a session that another owner is holding.
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What puts a session-owner hold in place is not shown, so it is unclear when this error would appear.