Invalid SSL Certificate Message

Under Tools/Site Health Status, I have recently been getting the message “Your WordPress Address is set up to use HTTPS, but the SSL certificate appears to be invalid”

I checked with my service provider iPage as recommended and they say the certificate, which they obtained from Comodo, is valid. Furthermore, the padlock is displayed on my site of https://www.torontowine.com and when I click on the padlock, that says the certificate is valid also. So why is WordPress telling me it is not?