Can't Bind Steam account to Mobile

[p3pyukari]

Hi...I started playing Onmyoji on Steam a few months ago and want to switch over so I can play the same account on my phone. When I go to my phone and click user center-->bind account-->steam, I get transferred to another page (sdk-os-mpsdk.easebar.com) to log in with my steam login details. However, after I typed in the details, it shows "invalid login" and I could not bind my account.

I know my steam login details is correct since it shows me the steam guard page after I clicked on the sign in button on the sdk-os-mpsdk.easebar.com page.
Does anyone have the same issue and know how to resolve?