Attempt to update contacts for EURID domain fails with an error:
Update of contacts for domain domainname.tld failed: Admin contact update failed: Command syntax error line:2 column:319: string length (0) is less than minLength facet (3) for clIDType in namespace urn:ietf:params:xml:ns:eppcom-1.0
Domain was transferred to EURid manually (not via PBA), admin (onsite) contact was not filled on the registrar side and therefore not returned on attempt to update the contacts. Issue has been identified as a bug with id #PBA-54081 ("The administrative contact update fails for the domain registered with EURid, if this contact is not specified on the registrar side").
The bug PBA-54081 was fixed in PBA 5.5.4 update, update to that or higher version.