Your iCloud Music Library session has expired

Have you checked this tick box is unchecked then in iTunes preferences and tried signing back in?

As my only solution previously was to be signed out of iTunes...

The other solutions mentioned in this thread did not help me (OS X 10.11.1 and iTunes 12.3.2.35). The solution in my case was:

In iTunes, on the top menu bar click the "Store" dropdown and sign out of iTunes. Then, log back in with the same account. Since then, I have not been prompted to reenter my AppleID each time I open iTunes.

These so called solutions only last a few days. I've now tested this over three 2 weeks, not working!

it lasted for a couple days but eventually i need to enter my password again. I use a Mac mini as a server, it runs for several days at a time. And in my case no solution anyone has posted yet has worked for more then 2 days.

It appears to me as though iTunes "home sharing" feature is the next culprit. Try to play a local fine on my apple tv thru home sharing and then the popup appears. I'm ******. just like always no testing ever gets done before an apple release. Just through it out there and let the customers test it for you. GARBAGE!

still running yosemite 10.10.5 too, not even capo. My father is running capo with the exact same issue.

I have taken into account everything tat was said here about start-up, changing the preferences (which I did), Logging out of the itunes store (I'm not logged in, so can't log out), etc., etc. NOTHING WORKS! It's annoying--wakes the computer up from sleep, interferes with pother processes...

Well, I finally solved this, with the help of an Apple tech person. It turns out that the issue wasn't that a session had expired--how could it have, I never have opened such a session, and never plan to. It was that Apple's system wanted me to update my payment information--though there had been no problems on this side when buying apps--really, minor scam from Apple...once I updated the payment information (for something I will never buy), the harassing dialogue windows stopped...

Goto iTunes, on the top bar click the "Store" dropdown and sign out of iTunes, then login again. The prompt hasn't showed up since.

Only going into ITunes, then ITunes store and logging out worked for me. On El Capitan 10.11.3. This also had the effect of unlinking my laptop to my other devices and my music library. Working on reconnecting that now.

Since I cannot determine how to start new thread on this forum I will have to ask my question here instead.

How do I get rid of this message: your icloud music library session has expired

I click cancel and it pops right back up. This needs to go away permanently. Is there something I can do, like in terminal somewhere to prevent this message for all eternity. And no, I don't have "Show Apple Music" checked and I have never purchased anything from Apple Store.

I would like to delete this icloud music library, which I don't even have.

This is so annoying when the message pop up everytime I login. I did try all the solution but no help. Whats wrong with the icloud thing!??

I agree. This is shameful. No help. Just an endless spin dry loop.

this solved it for me - thanks iJ-88

Same here , I have no "Apple Music " file in any drop down menu anywhere.If I go to "store" i prefs. it tells me I have this option disabled in prefs. yet I keep getting the message that my store session has expired. I have NO cloud devices of any kind just mac pro desktop??

To fix this error I logged into the iTunes store and made sure to update my card payment information. Once that was updated, I shut down iTunes and reopened it. The problem was solved.