Thanks for your prompt reply. I checked with Norgate support (who responded immediately, as Julian was expecting).
The issue was that I accidentally ordered US Gold (previously, I was on Platinum). In my code, I refer to the US universe with “NorgateIndexConstituentTimeSeries” which is associated to the US Platinum data (including also delisted stocks which are not part of Gold package).
After upgrading to US Platinum, everything worked again.