Here is when you can't trust your eyes. It was a card labelled as Sandisk but not necessarily one made by Sandisk themself. Since nothing can be written to it, the card has entered Read-only mode to protect itself from overwriting data on it. It is indeed dead, but the question you have to ask is why did it die so soon?
While it's true legit cards do come from the factory as duds, you also can't trust the computer telling you it's 64 GB as this is easily spoofable. In fact, if your computer states your card has a capacity of exactly 64 GB, then that's definitely a fake. 64 GB cards have actual usuable size of around 60 GB, give or take.
Amazon is susceptible of counterfeits mixing in with the legitimates due to their poor practice of stocking their inventories from different sources. As so long as source A and source B shares the same reported UPC (universal product code) and nothing look out of place at first glance, the two get batched together.