Indexed column

%3CLINGO-SUB%20id%3D%22lingo-sub-2763588%22%20slang%3D%22en-US%22%3EIndexed%20column%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2763588%22%20slang%3D%22en-US%22%3E%3CP%3EWhen%20create%20Indexed%20Column%20in%20list%2C%20why%20does%20sometimes%20Secondary%20Column%20is%20disable%2C%20however%20sometimes%20it%20is%20enable%3F%20Below%20example%20is%20disable%3A%3C%2FP%3E%3CP%3E%3CSPAN%20class%3D%22lia-inline-image-display-wrapper%20lia-image-align-inline%22%20image-alt%3D%22fishscience_0-1631979920923.png%22%20style%3D%22width%3A%20400px%3B%22%3E%3CIMG%20src%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fimage%2Fserverpage%2Fimage-id%2F311293i06BD917E9FF3E2CC%2Fimage-size%2Fmedium%3Fv%3Dv2%26amp%3Bpx%3D400%22%20role%3D%22button%22%20title%3D%22fishscience_0-1631979920923.png%22%20alt%3D%22fishscience_0-1631979920923.png%22%20%2F%3E%3C%2FSPAN%3E%3C%2FP%3E%3CP%3EBelow%20example%20is%20enable%3A%3C%2FP%3E%3CP%3E%3CSPAN%20class%3D%22lia-inline-image-display-wrapper%20lia-image-align-inline%22%20image-alt%3D%22fishscience_1-1631979984531.png%22%20style%3D%22width%3A%20400px%3B%22%3E%3CIMG%20src%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fimage%2Fserverpage%2Fimage-id%2F311294iFE8BE98D76511173%2Fimage-size%2Fmedium%3Fv%3Dv2%26amp%3Bpx%3D400%22%20role%3D%22button%22%20title%3D%22fishscience_1-1631979984531.png%22%20alt%3D%22fishscience_1-1631979984531.png%22%20%2F%3E%3C%2FSPAN%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAny%20suggestion%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2763588%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3ELists%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ESharePoint%20Online%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Occasional Contributor

When create Indexed Column in list, why does sometimes Secondary Column is disable, however sometimes it is enable? Below example is disable:

fishscience_0-1631979920923.png

Below example is enable:

fishscience_1-1631979984531.png

 

Any suggestion?

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