Let's Encrypt can't update certs after MIAB .40 update

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I had this same issue, basically you’ve got the install trying to create two accounts.

Here’s the link to my fix:

Multiple Let's Encrypt accounts preventing certificate from renewing

Two seconds more of digging, was all it took. In case anyone else has the same issue after upgrade, you’ll need to remove the inactive account from /home/user-data/ssl/lets_encrypt/accounts/acme-v02.api.letsencrypt.org/directory In my case, I had two directories there, 17fbXXXXXXXXXXXXXX and 58a9XXXXXXXXXXXXXX. I deleted the older one and then re-ran “Provision Certificate” from the TLS (SSL) Certificates page.

So in your case, you would need to delete the old (6e8fxxxxxxxxxx) directory.

Hope that helps!