Can you access the API when on Pro plan?

Hi I'd like to generate an api access token in order to work on some integrations with the Smartsheet API. However when I click on "Generate new access token", I get a popup saying "Upgrade for Smartsheet API". Yet here: it indicates that the API applies to Pro plan, which I am on.

Please could someone clarify is this information wrong and can one not get API access when on the Pro plan? Thanks.