Apparently, when he was in Molde, (DM run that story so it is maybe complete BS and sounds like it) we fecked up with time zones.
From DM article:
Haaland's agent Jim Solbakken had agreed to take a call from a representative of the English giants at 9am in mid-August to finalise the cut-price deal, which would have also included performance-related add-ons, the report claims.
However, Molde believed that United would ring at 9am Norwegian time (8am English time) rather than 9am Norwegian time, while Salzburg phoned at the correct time and tied up the transfer.