Hello @Amol Yadav ,
Thanks for reaching Microsoft QnA forum, Graph API GET /beta/search/bookmarks
is returning the same error you are getting. See below my test result.
500 - Internal Server Error are interim, search-searchentity-list-bookmarks, is currently in preview only, please note APIs under the /beta
version in Microsoft Graph are subject to change. Use of these APIs in production applications is not supported.
Hope this helps.
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