from help on ProtectionMode:
True if user-interface-only protection is turned on. To turn on user
interface protection, use the Protect method with the UserInterfaceOnly
argument set to True. Read-only Boolean.
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this is the least likely Protection Related attribute to return True since
this form of protection can only be set in code.
You need to check all 4 attribues
ProtectContents
ProtectDrawingObjects
ProtectScenarios
ProtectMod
all worksheet attributes.