Man, The Athletic has been on it the last few days. New article out with some more interesting info...based on anonymous club sources so take it for what you will.
There's far too much information in it for me to adequately summarize it. But the very high level summary would be that a number of players (Ronaldo, Varane, Casemiro, Sancho etc.) have had issues with ETH's style in various ways but mostly boiling down to them wanting more freedom on and off the pitch and not liking the structure that ETH installed. Thankfully younger players (specifically Garnacho and Mainoo) have responded well to ETH even in the face of criticisms.
There's still a substantial discipline issue at the club as more freedom generally led to more instances of indiscipline. This coupled with the lack of any executive authority (Murtough and even Fletcher really didn't give a damn about setting expectations) led ETH to bring even more structure and rules to the day-to-day which just made the problem worse with the players who didn't feel that was needed.
Some other info about the medical team and transfers...or lack thereof. Just an insane amount of information...if you trust the writer's anonymous sources.
https://www.nytimes.com/athletic/5549017/2024/06/14/erik-ten-hag-player-tensions-principles-play/?source=emp_shared_article