Crawled properties not appearing under Search schema for Site columns

Brass Contributor

I have created couple of site columns using PowerShell (CSOM) script in SP online site. I have added all these columns to libraries using PowerShell (CSOM). Later I have migrated hundreds of documents to different libraries which contains these site columns. 

I want to implement search refiners. So I wanted to add few of the created site columns to RefinableString properties. When I am trying to add the crawled properties to the Refinablestrings, I am not able to identify crawled properties for created site columns. 

I have created site columns two days before and migrated data 24hrs ago. I think this time is sufficient for crawling. 

Am I doing something wrong here?

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