I think Manchester United's motivation to win this match is very big because they have lost 2 times in the 2 matches they have played so if they don't manage to win this match it will be very difficult for them to qualify from the group.
And after seeing Manchester United's performance slowly improving in the last few matches, I think winning against Copenhagen is very possible.
Manchester United's performance is slowly starting to improve in my opinion and that will have a positive impact on the mentality and confidence of this team going into the next match and what you have to remember is that Manchester United is a big team that has a strong mentality on the UCl stage, so I have no doubts about them can get a win in the match against Copenhagen.
It would be very embarrassing if Manchester United lost again in their next match against Copenhagen, especially when they were playing at Old Trafford. United must forget the two previous defeats and must focus on the match ahead, this match will really determine the next steps for Ten Hag squad. Even if they only draw, United has a chance of qualifying for the European League, not again the top 16 of the UCL. On paper United can get three points over Copenhagen even though many doubt it.
An important victory after the international break against Sheffield United, became valuable capital for Ten Hag squad as their performance improved slightly. However, Copenhagen cannot be taken lightly, the Danish representative could pull off a surprise like Galatasaray did previously.