Hi @SmarTodd ,
Did your SQL server account have permission to access the folder? To enable SQL Server databases to use volume mount points, the mount points have to be mounted on a host volume that has a drive letter associated to it. We also need configure the appropriate dependencies.
Please check your steps of mount point configuration from below blogs to find if you missing some key point.
Adding mount points to a WSFC SQL Cluster ( FCI ) Instance
Configuring Volume Mountpoints on a SQL Server 2008 Failover Cluster running on Windows Server 2008
Best regards,
Cathy
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