Hi @venkata2023
did you select the correct catalog item ? does it have variables?
also check similar issue and see if this of any use
https://www.servicenow.com/community/workflow-automation-forum/get-catalog-variables-do-not-fetch-or...
https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0956915
Please mark my answer as helpful/correct if it resolves your query.
Regards,
Chaitanya
