Lost access to directories/files on Buffalo Linkstation RAID

[Microsoft Windows]

I had to send my system to Dell for repair of the heat sink/fan. It's running Windows 11 Pro and is connected to my small home network. When the system was returned, I could no longer access my network-attached storage drive (Buffalo Linkstation 220). When I open the Buffalo utility, I can see the drive and access its properties and setup... I just can't open the directories I've mapped on it. I can still access the Buffalo device from other PCs on my network, just not from the computer Dell just repaired. I haven't knowingly changed any permissions or other settings for the drive. Any ideas?

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