I disabled Wordfence and tried again, but am still getting the same error about updating the wp_options table. It does seem weird that Let's Encrypt is trying to do that, but it is definitely being recorded in the log that Let's Encrypt generates.
Here is the error, which is recorded after a script called sderr being called by bncert:
Problem running post-install step. Installation may not complete correctly
Error running /opt/bitnami/mysql/bin/mysql --user=bn_wordpress --host=localhost --socket="/opt/bitnami/mysql/tmp/mysql.sock" --database=wildsigh_wpmultisite2016 -p**** <<"$
UPDATE wp_options SET option_value='http://wildsight.ca/wordpress' WHERE option_name='siteurl' OR option_name='home';
EOF: mysql.bin: [Warning] Using a password on the command line interface can be insecure.
ERROR 1146 (42S02) at line 1: Table 'wildsigh_wpmultisite2016.wp_options' doesn't exist
child process exited abnormally
Error running /opt/bitnami/apps/wordpress/bnconfig.disabled --machine_hostname wildsight.ca: child process exited abnormally
I created an updated support ID, just in case: 9b595d60-c80d-b836-76c1-68f46b29d5c6