This may have been posted elsewhere, but I wanted it more visible in its own thread. This is from tsp.gov...
Interfund Transfers and the ThriftLine
Due to a technical issue, interfund transfers are currently unavailable on the ThriftLine’s automated system. We are working to resolve the issue and apologize for the inconvenience. In the meantime, you may complete interfund transfers by choosing option 3 from the ThriftLine’s main menu to speak to a Participant Service Representative. You may also log into My Account and visit “Online Transactions.”
Interfund Transfers and the ThriftLine
Due to a technical issue, interfund transfers are currently unavailable on the ThriftLine’s automated system. We are working to resolve the issue and apologize for the inconvenience. In the meantime, you may complete interfund transfers by choosing option 3 from the ThriftLine’s main menu to speak to a Participant Service Representative. You may also log into My Account and visit “Online Transactions.”