invalid_client on ApiKey authentication for C# S

[pedrodel99]

Steps To Reproduce

Use secret manager on bitwarden.eu then use this code using C# SDK.
`
var bitwardenClient = new BitwardenClient(new BitwardenSettings()
{
ApiUrl = "https://api.bitwarden.eu",
});

bitwardenClient.AccessTokenLogin(""));
`

Expected Result

Connection was suppose to be made...

Actual Result

Thrown exception Bitwarden.Sdk.BitwardenAuthException: 'Received error message from server: [400 Bad Request] {"error":"invalid_client"}'

Screenshots or Videos

Additional Context

No response

Operating System

Windows

Operating System Version

No response

Build Version

0.0.1-alpha1

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

[dani-garcia]

Hey there!

This seems similar to this older bug report #209.

Can you try setting ApiUrl = "https://vault.bitwarden.eu" and let me know if that solves your issue? Thanks!