What is the highest score possible at the Eurovision Song Contest? (up to 44 countries may participate, let's assume that is the case in this scenario)

Having a look at the rules for voting in this sometimes controversial competition, it's no wonder no-one has attempted to answer this so far. The voting rules are complicated and change frequently. The last iteration was implemented in 2023.
https://www.bbc.co.uk/programmes/articles/4WK6dmCPXrgWxLKzq7t2Rnn/voting-and-terms

According to this article https://en.wikipedia.org/wiki/Voting_at_the_Eurovision_Song_Contest#Top_ten_participants_by_number_of_points the Swedish song won with 583 votes which represented 66.55% of the maximum number. Therefore, mathematically, in 2023 the maximum number of possible votes was 876.