Existing Codex task cannot receive messages — invalid turn/start parameters #51530

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.930.61225

What subscription do you have?

pro

What platform is your computer?

No response

What issue are you seeing?

An existing Codex task cannot receive new messages. Submission fails with invalid turn/start parameters, including a simple acknowledgment-only message requesting no execution.

I submitted in-app feedback with diagnostics, then retried. The problem persists.

Feedback ID shown:
01a0f941-b6f3-7232-a9e5-7884dbbb7037

Expected: Send a message to the existing task while preserving its history and state.
Actual: Message submission fails.

Please investigate the task-submission failure. I am not requesting an override of execution approvals or safety restrictions.

What steps can reproduce the bug?

1. Open the existing Codex task with thread ID 01a0f941-b6f3-7232-a9e5-7884dbbb7037.
2. Enter: “Please acknowledge receipt; do not execute recovery.”
3. Submit the message.
4. Submission fails with an error referring to invalid turn/start parameters.
5. Submit in-app feedback, then retry the message. The same failure persists.

Expected: The task accepts the message and continues within its existing conversation.

Actual: Message submission fails, preventing continuation of the task.

Feedback ID displayed: 01a0f941-b6f3-7232-a9e5-7884dbbb7037.

No code snippet is required to reproduce this; it occurs through the task’s message interface.

What is the expected behavior?

Send a message to the existing task while preserving its history and state.
Actual: Message submission fails.

Additional information

No response