Extend the disk and run diskmgmt.msc.
- Find your expanded disk
- Right-click on the volume
- Select "Extend Volume"
- Follow the Extend Volume Wizard
If you don't see the unallocated space in Disk Management, you may need to rescan the disks.
You could also go to the portal and If you still don't see the space, verify the disk is properly resized and force a reload of the disk configuration through Azure
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Regards,
Abiola