Please disable 2FA on your user profile and re-enable it using the new authenticator app, then remove the previous account from the previous app. The exact step by step process would be:
Disable 2FA on your user profile within Signagelive (using a code from the original authenticator app).
Once this is disabled, delete your Signagelive Account from your old authenticator app.
Log back into Signagelive and re-enable 2FA on your user profile.
On your new device, download an authenticator of your choice and scan the QR code shown on-screen.
Enter a code from your new authenticator app and take notes of your the new recovery codes.