I got this error when I clicked on “Create new connection” in the User Profile Services App, to setup a new connection to the AD. If you get it, just restart the User Profile Synchronization Services under “Services on Server” in CA.
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Welcome! My name is Lise Rasmussen, @SharePointBabe. On my blog I write articles about apps and services in Microsoft 365 like SharePoint, Teams, Power Apps and more. I am the host of WITGirls podcast where I share news and experiences about the same topics. More info in About.