If you get an error "can't log in to service", please try to re-connect your account via the Loola settings page:

1. Open the settings page by clicking the gear icon next to the Go Live button:

2. Select the platform you'd like to re-connect, and click "disconnect":

3. Click the platform again and re-connect your account.

https://support.loola.tv/en/articles/1755882-connecting-your-tiktok-account