I just installed Vegas Pro 21 Edit (the 365 subscription version) and I cannot login to the "text to speech" function. It either (1) hangs if I try to login from the "text to speech" tool, or it won't even let me click the "login" button if I am already logged in on the VEGAS HUB prior to attempting to use Text to Speech. Here is a video of what is happening. 
Please advise if anyone knows how to get this to work.
Maybe you have to try again after first inserting an empty soundtrack.
Maybe you have to try again after first inserting an empty soundtrack.
Thanks for response - attempted this and still got the same result.
Sorry to hear, this how it goes with me
Follow up to this - eventually Vegas support got back to me and said to install the software on the "hidden admin profile" - this appears to have fixed the issue. Pasting their instructions below for anyone else who has this issue in the future.
Let's check to see if uninstalling and reinstalling the software to the hidden admin profile helps. Windows comes with a hidden administrator account which must first be enabled. To do so:
1. Type "Command Prompt" into Windows search or Cortana
2. right-click on the Command Prompt result that appears and choose "Run as administrator"
3. After the command prompt opens, type: net user administrator /active:yes
4. Double check to make sure the command is entered correctly and hit Enter on your keyboard.
5. After running this command, the prompt will respond with: command completed successfully
6. Go back to the Windows desktop , and press Ctrl+Alt+Delete and select “Switch User” to find the Administrator account, then select it.
7. Install and activate your software applications onto this profile.
If this works for your issue, you can then copy the desktop icon for the software. Once you do that, you can then log back into your normal account and paste the desktop icon there to launch it.
I had the same problem. My method is to use it in Vegas 20 instead of 21. In 20, it is more stable.
I have the same problem. For days now, text-to-speech told me that i have to log in but the log in button is unresponsive. Switching to admin accounts and other workarounds is not what I would like to do given that this is paid and quite expensive software. I would very much appreciate that this gets fixed properly as it has been occuring quite often over time.