Error: At least one of url or chain must be present for Etherscan config bsctest

[linghuccc]

In my project,
in file .env, I have defined
BSC_TESTNET_RPC_URL=XXXXXXX
BSC_ETHERSCAN_KEY=XXXXXXXX
;
in file foundry.toml, I have defined
[rpc_endpoints]
bsctest = "${BSC_TESTNET_RPC_URL}"
[etherscan]
bsctest = { key = "${BSC_ETHERSCAN_KEY}" }
.
Then I run "forge script script/Deploy.s.sol:DeployScript --rpc-url bsctest --broadcast --verify" in the terminal window.
But below error came up:
Error:
At least one of url or chain must be present for Etherscan config bsctest