This article lists and describes common integration errors that may occur with Microsoft products.
Integrations that connect to a Microsoft Product including by not limited to: M365 Planner, Power Apps, Tabular Data, Project Online, Project for the Web, SharePoint Online.
This error occurs when using an account that has Multi Factor Authentication enabled or if the username/password combination is incorrect.
Please make sure that a service account configured in OneConnect does not have Multi Factor Authentication (MFA) enabled. Please also verify that the username and password are correct.