Why does Tradovate connection open my browser?
Only if you chose Sign in with browser. That option opens the normal Tradovate page in your default browser, you approve it, and Copilink picks up the result when you come back. Automatic sign-in does not use your browser at all. It signs in through a small built-in page and only shows it if Tradovate asks you for a code, a CAPTCHA, or consent.
Keep Copilink open
Leave the connection dialog waiting while you approve in the browser.
Approve the correct environment
Use the Tradovate Demo or Live login you selected in Copilink.
Return to Copilink
Wait for account discovery and confirm the accounts you expected are listed.