Error added: 2021-09-30T15:21:19Z
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
If you know the answer, please add your own solution below.
If you don't know, but find out later, please come back and share your answer - there will be other people
struggling with this too.
If you want to be notified via email when this is solved, enter your email address here: