Had the very same situation last month. As advised above, remove your FF number from each reservation and add it again. Sky Priority should show up instantly.

On that note, agents are not always as helpful or knowledgeble as you would expect them to be. A nice lady guarding the security SkyPr line at MSP last week would not let us through as we did not have capital SKY PRIORITY written all over our boarding cards which were issued in Amsterdam. We had "Sky Priority" next to the boarding zone on the BPs but it meant nth to her ("it's just for boarding, not for security", "Nooo... if you were SP I would see "BIG LETTERS").

Going through normal line would mean missing the flight but fortunately self service machines were close by, we reprinted our BPs, with "big MSP approved letters" and she then was happy to let us through, loudly praising us how smart we were!......