SSL for web apps that are sub domains

Hello, I've got 2 web apps up and running which are sub domains of my domain which is hosted at Wordpress. The sub domains are weather scrapers - and I have selected the auto-renew Let's Encrypt option for the HTTPS certificate but this does not seem add a certificate as it still shows as "Not secure" . I've checked with Word press and have been told that I do need to get the certificates installed at this end which makes sense. Any help would be greatly appreciated! Thanks, Jay

Are you actually visiting the https address?

Hi Glenn - Good point! Duh! I switched the forced HTTPS, reloaded and voila!! Thanks for your help!