The following REST call:



"Input string was not in a correct format."

Does anyone know where I have gone wrong in this?

  • Can you try using double quote. I mean (subscriptionId="caa09cae-3955-4c26-bb7e-24b4a95294b0",itemId="1ff07e38-7847-4786-90fc-28bd3b2255c9") Feb 15, 2016 at 5:15

2 Answers 2


Just an issue with the parameter type; the itemID needed to be the ID, not the GUID. Documentation here:



REST CALL, many of us knows there are sharing on how you could do that in CSOM, but honestly that is not a REST API. I have shared how you could start a workflow in sharepoint online on office 365 by calling the REST API at _vti_bin/client.svc/ProcessQuery, basically you will need to do HTTP Post at the end point twice, one to get the workflow subscription and the other to trigger the workflow instance to start, find it here https://community.nintex.com/community/tech-blog/blog/2017/01/18/stronger-together-nintex-workflow-cloud-office-365

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