The CryptoBot test-net is works properly for me:

https://t.me/testgiver_ton_bot

For getting test TON coins use the following:

TestNet

1. Use the @testgiver_ton_bot if you need a small amount of TestNet TON coins. You can get 2 TON coins every 60 minutes via this bot.
2. If you have a task that requires a much larger amount of test TON coins, you can ask for help from the Telegram community (https://t.me/tondev_eng or https://t.me/tondev) with a description of the reason why you need more than 2 TON coins.

Sandbox

1. To get test TON coins for sandbox test environment, you should use @sandbox_faucet_bot. It allows getting 100 test TON coins every 60 minutes.

https://ton.app/utilities/faucet

I have written article titled 'Testnet Faucet — Receive testnet coins on TON'.