The expression "Title eq 'Zk" is not valid
What causes it and how to fix it:
- An unencoded # in a $filter value cuts the URL — SharePoint gets half a query and answers 400The browser drops everything after # as a fragment, SharePoint gets an unterminated literal and answers 400; guest UPNs (#EXT#) always hit it; & cuts the expression and a raw + arrives as a space, so a valid literal silently matches nothing (measured) — encodeURIComponent(odataString(x))Cause and fix →