Yes, but you provided no context, no background. You had not mentioned your iPhone at all. Only your Mac. Hard to offer any kind of advice with no details whatsoever and only an angry rant.
papagnigroup wrote:
However, on my iPhone, only a fraction of my music shows up. I am perplexed. I do not have "more than one iTunes account." I have only one.
Since you provided no context or background, I mistakenly assumed, by the error you posted, that you had created a new account on your MacBook and were not able to see your music because of it. That was my mistake and I apologize.
Anyway, having provided a bit more context and if your music appears and can be accessed on your Mac in its entirety then perhaps you can tell us what happened on your iPhone prior to this occurring?
Did you get a new iPhone, and you set it up from a backup of a previous one?
Did you wipe your exiting phone? What exactly prompted this?
How did the music get on the iPhone originally? Was it all purchased from iTunes?
With that said Apple Music is a subscription service, unless you were using it before, then it has no relevance here, and has nothing to do with the current state of your music.