Hi @bdc604 ,
How is your flow created? Please share a screen shot.
About “Occasionally I’ll be posting an http request at it to add or remove role assignments”, do you have another flow to be used to modify the role assignments?
I have made a simple flow with the trigger “When an item is created or modified”, however, when I try to change the role assignments on SharePoint, the flow won’t be triggered.
Do you have any other flows that will update/modify the list items?
Best regards,
Mabel