Cannot upgrade lego gem

to tech support …I cannot upgrade viper’s bite two star from rank 8 to 9, i have one rank 3 two star and two rank 5’s two star as the requirements; when i click autofill, one of the rank 5’s is greyed out…is this a glitch?
update: I didn’t realize that lego gems can be unlocked or locked, the greyed out gem was locked; after unlocking it, I was unable to upgrade from rank 8 to 9

yes, just saw that it was locked…thanks for the quick reply!

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