sendMessage not received by options page onMessage in Safari

I have ported a Chrome/FireFox extension. One of the things that does not work is receiving message from background to a options page (safari-web-extension:///page.html)

I dont get a error message or any details back from the promise. Any idea where this goes wrong?

Background:

browser.tabs.sendMessage(tab.id, { message });

Options page:

browser.runtime.onMessage.addListener(message => {
        console.log(message);
});