Call them and ask. TDA has no shares to loan. Similar reports from people who use other brokers: None, or hard to borrow. Everybody could call their brokers and post updates on shares available to loan. It would be good insight.
Look up Trey's Trades.... WeBull stopped giving the option to short AMC. Trey talks about it more than once. Where there used to be a short option button there is NONE~! Ain't no shares available? Could it be?