While most people get the vtp config setup they sometimes forget to trunk the interface. When all your vtp stuff looks right (but config rev not incrementing/updating) then it's probably a trunking issue on the int itself - try switchport trunk encap dot1q/isl then switchport mode trunk - should do the trick - kerry_13 had this exactly right, that answer should be at the top for all the times i've seen new guys do it.
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