Can it be used by other users in your organization?
Try logging into the Teams web client with a browser to check if sequential approvals are available.
I thought that it was planned for May 2023.
Yes, the sequential approval process was introduced in May. However, the client availability time for this feature is not uniform, and you may have to wait for a while.
Here's a roadmap for Teams sequential approval updates: Microsoft 365 Roadmap | Microsoft 365.
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