Unable to gnerate a summary of articles on websites using Safari

I'm using macOS Tahoe26.0.1 on a MacBook Air M2 and Safari V26.0.1

When I open website containing articles I like to use the reader view when available and sometimes, to save time, I like to use Apple Intelligence to summarise the article to get an overview.

HOWEVER, Summarise doesn't seem to be working lately, over a range of websites

Is anyone else experiencing this issue?