[Need Help] Wildcard SSL on Wildcard subdomain

[apasiboy]

Hello,
i need help how to setup ssl let's Encryption on dynamic subdomain, for example :
subdomain : https://abcd.mysite.com will be poin to https://mysite.com/?keyword=abcd
if i use http, all run good but i confused why SSL not working. SSL already installed on https://mysite.com

real example is site uptodown.com, they use dynamic subdomain but with ssl, example :
https://motioninjoy.en.uptodown.com/windows
you can try dynamic subdomain like https://need-help-on-vesta.en.uptodown.com , you can look the subdomain is active but redirect to 404 page results.

I need your help .. the good dev man :D

Thank you