Is there a way to test run Overlay extensions other than going Live on a channel?
What I’m doing is streaming on my testing account using: Dashboard -> Extensions -> your extension -> Versions -> your version -> Access -> Testing Accounts
Still kind of weird the need to go live for developing an extension 
Thanks Patrick. That works
(… but as ocgineer said, it’s still weird that we need to go live to test)
I noticed you need to put the account id for Testing Accounts. How are you able to retrieve an account id?
https://staging-discuss.dev.twitch.com/t/user-id-by-nickname/11743/
https://staging-discuss.dev.twitch.com/t/private-extensions/11835/5
https://dev.twitch.tv/docs/v5/guides/using-the-twitch-api#translating-from-user-names-to-user-ids
For a quick way you can also whisper ohbot on Twitch with #3v !id [username]
Thanks @3ventic and @BarryCarlyon ! I was able to find it using ohbot.