Ameritrade must physically receive the shares from the company through the transfer agent before they can be in the account, and they haven't received them.
In this case the transfer agent is JP Morgan and the standard time for receiving shares after a split is 3-5 days. AT has been given no date or notice when the shares might arrive.
Shares are not actually (and magically) "split." New shares are delivered into your account from the company.
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