The certificate provided is working on 1/2 of devices tested on. Can you please repair the certificate in acordance with the following:
It is possible that we will get a certificate for one name (for example,
petsofnetlify.com ) and not for another (for example,
www.petsofnetlify.com or some domain alias). In this case selecting Renew certificate should resolve the issue. If it doesn‘t, please post in the Netlify Support Forums so our support engineers can repair the certificate.