vosykapavel

Oh, I just test it with WordPress 5.8.1 and it works now.

I temporarily solved this by creating the option in database manually. So I can test the rest functions of this nice looking plugin.

See screenshot: https://pasteboard.co/ipkQTTTrnX6D.png

But it is not solved overall.

(PHP 7.4, WordPress 5.7.3)

Oh, I see, register_setting() should take this.

But it’s strange, that in database it is storing only multiple-domain-add-canonical option.

See the screenshot: https://pasteboard.co/A9ODKB9fHHyB.png