
The following action does not cause the flow to fail, but the multiselect lookup column is not updated.
Headers
{
"Accept": "application/json;odata=verbose",
"Content-Type": "application/json;odata=verbose",
"IF-MATCH": "*",
"X-HTTP-METHOD": "MERGE",
"": ""
}
Body
{
"__metadata": {"type": "SP.Data.New_x0020_PCNsListItem"},
"TeamRepliesNeeded":[{"Id":1},{"Id":2},{"Id":3},{"Id":4},{"Id":5},{"Id":6},{"Id":7},{"Id":8},{"Id":9},{"Id":10},{"Id":11}]
}
I was able to make the update by using formValues instead as explained in How to update multiple lookup SharePoint column with Power Automate.