We throw this error Invalid full name format.", "windowsIdentity.Name" when the windowsIdentity.Name is not in format Domain\USER. I am not able to replicate this issue locally with LDAP and Windows authentication. Can you check what the the identity name?
Windows Authentication should be set to on.
Site/Sitefinity/Services - Windows Authentication should be off and Anonymous Authentication should be on.
All the best,
the Telerik team
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