Synology TLS-SNI-01 End of Life Email?

As root, or using sudo:

ls /usr/syno/etc/certificate/_archive

You will see INFO, DEFAULT, and something else. You need the something else. If you have multiple something elses, you will need to do this for each one.

/usr/syno/sbin/syno-letsencrypt renew -c <something>

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