Hello. If you just install a GoGetSSL certificate on your sub domain, but when you open your site, you see a “this certificate is untrusted” error, visit
https://support.sectigo.com/articles/Knowledge/Sectigo-Intermediate-Certificates
Find “Root Certificates” section, click the first download link, and install it.
Install instructions is vary depending on operating system you use. That’s it, have a good day!
If existing topic exists, let me know. 
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It’s probably the cache
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