How can I link xbox account with PC

Hello,
I bought an early access code in the XBOX store and I'm playing on XBOX Series X.

But for the easy trading, I want to play my chracter on PC via GGG client.
I downloaded a client from GGG website and installed, but I can't sign in on PC.

But, there are only boxes of email and password.
When I put my xbox account in the email and password box, it doesn't work.

However, GGG webpage allow me to sign in via XBOX Account.
In this case, I can sign in to click xbox icon.

How can I log in on my PC with xbox account?

Login on POE website.

Click your username, should be "Logged in as xxxxxxxxxx" < you click that username

"Menage accounts" on the right site

Looking for Microsoft

"Connect"

Should work