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There could be several reasons why the Onchange function is not functioning properly in React using TypeScript when selecting an option:

1. Incorrect event type: Make sure to specify the correct event type for the Onchange function. In TypeScript, the event type for a select input is "ChangeEvent<htmlselectelement>."

2. Binding the function: Ensure that the function is properly bound to the component in the constructor or using arrow functions.

3. Incorrect state updates: If the Onchange function is responsible for updating the component's state, make sure that the state is being updated correctly.

4. Incorrect value handling: Ensure that the selected value from the options is being handled correctly in the Onchange event, whether it's being passed as an argument or directly accessed from the event object.

5. Component re-rendering: If the component is not re-rendering after selecting an option, ensure that the state update is triggering a re-render of the component.