it means they got surge of request to their faucet and they decided to pause it temporarily.

as the message implied, just try again in the future when faucet already open again, it was massive though even in twitter and everybody is trying to get into their testnet hoping for future reward some even selling the testnet token which is pretty ridiculous.

but as the network name itself implies, it's testnet, which means currently in testing phase, expect many error like this to happen.