If the original Google Authenticator still works, log in your Matrixport account, click [Account] - [Security Settings] - [Google Authenticator] - [Replace], follow the instructions and reset your Google Authenticator.
If the original Google Authenticator still works, log in your Matrixport account, click [Account] - [Security Settings] - [Google Authenticator] - [Replace], follow the instructions and reset your Google Authenticator.