Hi Shahul,
Can you please check the following
Ensure that you assign your knowledge article in the application areas of the schema (screen shot attached)
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If the system needs to auto suggest knowledge article click on the specific categorization assignment block as shown below
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You can then scroll below and assign the specific knowledge article(screen shot attached below) to the categorization.
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If you catalog category for the schema configurations are with category type C, then the know article assignment block would be below(check next screen shot) however if the same is D then the knowledge article assignment block would be above when you click on more in your service requests incidents problems.
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As explained above(attached screen shots)
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However ensure that you select the correct categorization entry and then navigate to the knowledge article assignment block and click on auto suggest(as explained above)
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Kind Regards
Atul