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I need to create "cross site collection lookup field" in the SharePoint Online List. I can programmatically change "List" and "WebId" in SchemaXml from LookUp field. It helps to get "cross site" lookup, but not "cross site collection". I got an exception "Microsoft. SharePoint.Client.ServerException: 'File Not Found.'" when I tried to save changes in SchemaXml for "cross site collection".

Is it possible to create "cross site collection" lookup programmatically? If yes then how?

Or I should learn how to work with SPFx and how to change List and get a lookup through REST API?

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SharePoint does not support lookups pointing to other sites. But you can take a look at 3-rd party solution - Plumsail Forms. It allows you to link lists from different sites and emulate behavior of a lookup field with a regular text field with built-in field customizers.

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