Cant login to Steinberg Download Assistent

I can’t login to Steinberg Download Assistent. I launch “Steinberg Download Assistent” it asks me to “Sign in” I click it and it takes me to a login site and I log in and it asks “Do you want to allow this page to open “Steinberg Web”?” I click “Allow” but “Steinberg Download Assistent” is still on the “Sign in” and nothing happens, I can’t do anything.

I was using Safari browser, this works with Firefox browser.

See video:

No problem here with Brave browser, Windows 10. Maybe check security settings on Safari.

Thank you Poinzy.