Can't load available device in Webcore

I’m using the ST Hub v2 US(version 000.025.00026)

Recently, I recognized device cannot added on webcore.

In other words, It can’t get a list of devices when I choice ‘available devices’ in webcore.

And no logs are generated in ‘live logging’ in groovy IDE.

This problem seems to be happening to Samsung ‘Korean Account’ users.

But I don’t know the exact cause, but is there a way to solve it?

Attached are some screenshots.