Hi @badams2,
Would you please share more information about the action you used, and the detailed error message?
Is this error occurred with the SharePoint - Create item Action?
This seems to be related with the data source side.
If you are using the create item action, please take a try to switch to another SharePoint list, see if the error insists.
Besides, would it be convenient for you to share the flow running detials URL?
You should notice there is Flows/Number/Runs/number stated in the URL, make sure the number is copied, which would be helpful for further investigation.
Regards,
Michael