I need to access Marketing Cloud but Salesforce Authenticator is connected to the old mobile device, Which I don't have access to. How do I disconnect the old Authenticator so that I can connect to the new device
Firstly as suggested by Lukas you need to have admin role to perform this.
- Navigate to Setup
- Users -> Users
- Select your username and click on it to open User record.
- Click on Revoke [this will de-link your user with the authentication app]
Once the above steps are done, the next time you login,