This seems to be the contrary problem to two other cases on this forum where developers have reported that a conmpany comes back from an API cal but is not seen on the website. Ours is the other way around.
It can be reproduced by trying this url.
https://api.company-information.service.gov.uk/company/15366432
does not bring back the company (ststus is null in stead of 200) and yet the company (TJ Cafe Bistro) shows on the CH website.
the company officers one below, however, is fine
https://api.company-information.service.gov.uk/company/15366432/officers
All other Company numbers fed in have worked fine for more than a year, now.
So we do not believe it is an authentication issue.