Why popout Sign in to itunes always comeout when I want to update xcode

I have updated mac from Ventura to macOS Sonoma 14.5. I want to update xcode 15.4 in Appstore but when I click Update, popout sign in to itunes always comeout. If I successfully signin, another popout sign in to itunes keep prompt too. It said sign in here but I already signin and there is not button signin in the popout instead of download and cancel. Why? Its really frustating to update the xcode.