I upgraded to Vegas Pro 19 expecting to have text to speech as an advertised upgrade. When I try to connect to the hub it says I'm not authorized. How do I utilize text to speech?
The first thing to establish is that you have bought Vegas Pro 19 365; that is, as an annual or monthly subscription. As per the Vegas comparison webpage - https://www.vegascreativesoftware.com/us/product-comparison/#productMenu - Text to Speech is only available with Vegas Pro 365 ("Exclusive in subscription").
If you purchased Vegas Pro 19 under either the "New purchase" or "Upgrade" options, Text to Speech, Royalty-free stock content and Mobile to timeline unfortunately do not come with either of those 2 purchase options.