DOI landing page fails

I have tried to go to the DOI landing page for a number of the DOIs displayed in icat e.g. https://doi.esrf.fr/10.5072/ESRF-ES-84744725

But the page fails to load the metadata with this message:

Not found

Sorry, there was a connexion problem with the datacite server.

Are the DOIs supposed to work. If so please fix this. If not remove the DOI from the displayed columns in ICAT.

Thanks