Screen reader does not read contents on first (starting) slide

I have a similar problem. NVDA is not reading my first slide, but it will the rest, despite being correct in focus order. (Incidentally using Chrome). Also it's published and hosted on LMS as testing there is meant to be more accurate than in Review. It reads the volume next buttons, built in, but not the text.  Please help
(Technically it is the second slide, but the first that has anything available to read by screenreader).

...I have since treed and if I click around enough I eventually on this slide come across a 'skip to main content link', which then reads it. but it's very around the houses. Is this correct, is it meant to act differently to the other slides? Is it also unavoidable that it reads out each new slide as  'clickable main landmark frame'? thanks