Is ITX restricted to beta users now?

I have followed this article to use ITX.

I enabled ITX and added API request of relay transaction.
However, I got an error that says ITX is only for bate user, when I called relay_getBalance method.

(node:13447) UnhandledPromiseRejectionWarning: Error: processing response error (body="{\"jsonrpc\":\"2.0\",\"id\":42,\"error\":{\"code\":-32004,\"message\":\"This method is currently only available for registered ITX beta users\"}}", error={"code":-32004}, requestBody="{\"method\":\"relay_getBalance\",\"params\":[\"0x027xxxD6D\"],\"id\":42,\"jsonrpc\":\"2.0\"}", requestMethod="POST", url="https://polygon-mainnet.infura.io/v3/848xxxxx13", code=SERVER_ERROR, version=web/5.5.1)

Could you please teach me how to enable or register beta user?

Hi @yxxw and welcome to our Infura community.

Could you please open a support ticket (Ethereum API | IPFS API & Gateway | ETH Nodes as a Service | Infura) and share with us the following details: ProjectID and Params you’re using. We’ll try to reproduce this behaviour.