Thanks for the quick reply. I have Yoast SEO activated and thought it was optimized. The Bing SEO analuzer reviews the rendered html code and the title is clearly not tagged with H1. Here is the screenshot from the report, with the title highlighted.
Bingo! The h1 tag issue has now been solved, thank you! The only little glitch is the extra space between the title and the tagline. When I remove the <br …/> code, as you suggested, the tagline moves up to the same line as the title. I want it below the title.
P.S. I now have another issue with the meta description, but will create a new post for it.