My apologies. I have provided updated credentials.

I have provided administrative access. This is a live site and disabling plugins will remove critical functionality. As a result, we have left plugins enabled but grant you permissions to temporarily disable them while investigating this issue. We would ask that you let us know when you disable them and reenable them as soon as possible.

FYI: We did try disabling plugins immediately after this issue appeared, but it did not resolve the issue.