Hey everyone!
I will check in with the SiteGround team as well. We have been working closely with their team to resolve any Let’s Encrypt related issues and if they have not yet already been addressed and fixed, should be shortly.
Specifically for renewals, I know you can message their support team and they can do a manual renewal on your domain while any underlying issues for autorenewal are ironed out!
Thanks again for using Let’s Encrypt!
Best,
JP