For resolving problems with supplier accounts (UNGM): Submit a request – UNGM Help Center.

For resolving technical problems with participation in tenders / tender submission (In-Tend): support [at] in-tend.co.uk (support[at]in-tend[dot]co[dot]uk);+44 114 407 0065.

For general questions on ICAO procurement: procurement [at] icao.int (procurement[at]icao[dot]int)