Bug: Account initialization fails silently with unsupported chain configuration

### Describe the bug

When initializing an account with an unsupported or incorrectly configured chain, the SDK may fail without providing a clear or actionable error. This makes it difficult for developers to understand why the account cannot be created or used.

### Steps

1. Install the Account SDK.
2. Attempt to initialize an account using a chain ID or network configuration that is not supported.
3. Try to perform an account-related action (e.g., fetch address or send a transaction).
4. Observe the resulting error or lack of clear feedback.

### Expected behavior

During account initialization, the SDK should validate the provided chain configuration. If an unsupported chain is detected, the initialization process should fail immediately and throw a clear, descriptive error. The error message should explain why the chain is not supported and guide the developer on how to resolve the issue.

### Version

_No response_

### Additional info

_No response_

### Desktop

_No response_

### Smartphone

_No response_

The issue does not name files or tests. Start by locating the account initialization entry point and the handling of supported chain configuration, then reproduce initialization with an unsupported chain ID. Done means initialization fails immediately with a descriptive error explaining the unsupported chain and how to resolve it.

Written by the indexing model from the issue text.