Patching Powerapp to Sharepoint List anonymously

barryjarvis 

You will need to use a Power Automate flow that performs a "Send an HTTP Request to SharePoint" Action to the url

_api/web/lists/getbytitle('list name')/items(<itemid>)/validateUpdateListItem 

using this body

{ 

  "formValues": [
                   {
                     "FieldName":"Title",
                     "FieldValue":"my new Title"
                   },
                   {
                     "FieldName":"MyOtherField",
                     "FieldValue":"mynewValue"
                   }
                ], 
  "bNewDocumentUpdate":true 

} 

You will have so specify which fields to set in the json array

https://www.concurrency.com/blog/may-2022/performing-a-system-update-of-a-sharepoint-list-item-through-power-automate
https://techcommunity.microsoft.com/t5/microsoft-sharepoint-blog/update-file-metadata-with-rest-api-using-validateupdatelistitem/ba-p/1365682

barryjarvis You cannot achieve this using only PATCH function in power apps. You have below options:

1. Pass data from Power apps to power automate flow and use the power automate flow with service account (admin) account to create items in SharePoint lists
2. If you are using complex data in power apps and unable to pass it all to power automate or facing any issue: You can copy the item from the current list after PATCH and add it to another list using power automate flow as given in this thread.

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