Please check Dashboard > Settings > Genera > site URL: if your site is https://… it should be the same URL there. Then save the Theme Settings to make the icon visible.
Please provide your site admin access I will check the header settings, I still do not catch the problem.
Thanks for the access, I saved the Theme Setting > and they appeared, I check in another browser and they do not I am checking with the dev team. I will get back to you soon.