Login failed. please try again

[KBecker57]

I get the above error when I run the ANetEmvDesktopSdk.Sample app. I enter the API Login ID: and Transaction Key in Username and Password. I got the credentials from the Merchant page while logged into my sandbox account  I also check the SANDBOX checkbox. Does anyone have any idea what I'm doing wrong?

I bought an Authorize.net 2.0| BBPOS AWC Walker C3X | Bluetooth | Card Reader.

I am trying to integrate my POS program that I developed using .net C# with this card reader.

Thanks, Kevin

[Chad7787]

Your error suggests the API Login ID and Transaction Key are likely incorrectly entered into the Username and Password fields. In the sample app, you should usually enter the API Login ID into uhmegle Username and the Transaction Key into the Password.
Also, ensure you are using Sandbox credentials for the Sandbox environment. Double-check for typos or copy-paste errors when inputting them.