Most common authenticator apps offer multi-device capabilities so you don’t have to do anything when using a new device. Please refer to your authenticator app documentation for further details.
If your authenticator app doesn’t offer multi-device capabilities please disable 2FA on your user profile before deleting the account on the old device as a verification code is needed in order to disable 2FA in Signagelive, then re-enable it as usual using the new device; it is then safe to remove the previous account from the previous device. The exact step by step process would be:
Disable 2FA on your user profile in Signagelive. A code from the old device is needed.
Delete any recovery code previously saved (these were generated when 2FA was enabled)
Delete the account on the old device
Enable 2FA on your user profile in Signagelive.
Scan the QR code on the new device
Enter a code from the new device and save the new recovery codes