I do have two ID accounts, USA and MEXICO, just the one in Mexico is activated with iTunes Match, last week I was in USA and i bought 1 cd, when i tryied to find my music (Mexicos ID) there was no music, I checked at the config and activated again de Mexico´s ID and the iTunes Match... the the CD was gone. I logged to my US ID again, purchased again the cd (it just download) and I sync to my computer and I said that I have to copy the CD manually (I don´t know how) and when i tried to activate my Mexico´s account it appearead a message that I have to wait 90 days. IT IS THE SAME IPHONE!!!! Why do I have to wait 90 days to get mi iTunes Match music in the device i got it?!?!?!?!?!?!
When you turn on iTunes Match or Automatic Downloads, or when you download past purchases on an iOS device or computer, that device or computer becomes associated with your Apple ID. This article describes how to manage these associations.