I have a flow which creates a series of tasks in a Sharepoint custom Task List whenever a new entry is added to a Sharepoint Matter List. My custom Task List has a lookup column for Assigned. I can see that field in my Flow and can pick the appropriate AssignedID for the action. However, running the Flow the action always fails with Bad Request. Further Info: "A value must be provided for item. clientRequestId: 71efedc3-1655-4278-b417-a2b3e500b013." Not sure where it's getting "clientRequestID" unless that is simply a system-generated tag for the error. Any help would be appreciated. Note: the lookup is NOT multi-value
Per testing, the Assigned to field is not readable under Microsoft Flow.
And because of that, the AssignedTo or the other field that related with the Assigned field would be empty. So if you use the value from the assigned related, it will then generate the Bad Request error.
To workaorund this, please consider take use of a Text field to replace the Lookup column.
And if you would like the Assigned to to be supported under Microsoft Flow with the TASK list, then please consider submit this as an idea under Microsoft Flow idea forum: