Nord Pool publishes only preliminary Day-Ahead auction prices during weekends.
During weekends, only preliminary Day-Ahead (DA) data are published by Nord Pool. These data are for delivery on Sundays and Mondays and can be found in a separate set of DA contracts in Montel's services.
For example, preliminary DA data for the bidding zone "Kristiansand" (NO2, SpotKey 22) are published on Saturdays and Sundays and can be accessed by using the product "NO2 Preliminary Price" (SpotKey 120).
On Mondays, official data for delivery Sunday and Monday are also published in the "NO2"-product (SpotKey 22). This usually happens around 09:04 Monday morning.
Note that there might be differences between the preliminary and the official prices. This is due to different exchange rates being used to calculate preliminary (exchange rates from Friday) vs official prices (exchange rates from Monday).
See info on Nord Pool's page: https://www.nordpoolgroup.com/en/trading/Day-ahead-trading/Preliminary-prices-and-exchange-rates/