Hi!
Some endpoints for the Algod v2 API are disabled.
You can find a list of the available endpoints here: AlgoExplorer API: Algorand Node API end-points will be limited.
If you want to get the current state of an account, you may want to use the indexer API instead: https://algoindexer.testnet.algoexplorerapi.io/v2/accounts/FANMLQLXLECNZRYFVNZS6TSNEUQ7KKIJOWSUCUXG727XACM7QRT2DLY25I