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>> https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_callouts.htm
Please check if all the steps mentioned are followed and also, can you please check the response code that you are getting after making the callout.
Also, I would suggest you to check this link: https://www.mstsolutions.com/technical/apex-callouts-to-display-external-data-in-salesforce/
Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Thanks.