This device doesn't have a Mann family certificate installed yet, so
brain.rrmann.com can't tell whose brain to show. Ask Russell for a
.p12 if you haven't gotten one.
.p12 → enter the export password → name it "Mann
brain". Then reopen this page in Chrome..p12 from Files →
Settings shows "Profile Downloaded" → install it, entering the export
password. Then reopen this page in Safari or Chrome..p12 into your
browser's certificate store, then reopen this page.