"Special Requirements to perform bulk actions" error on attempted Workspace Restore or Rebuild

Hello,

I'm attempting to restore or rebuild a workspace that was active yesterday but then suddenly became unavailable (unreachable) with the standard "unable to connect" message. The unable to connect behavior has persisted for more than 24 hours.

Things that have been tried:

1. Reboot Workspace - still unreachable.
2. Stop / Start Workspace - it stops and then we restart it, but it is still unable to connect.
3. Adjusting / adding root and user disk space - the space is adjusted and reflected in the workspaces listing.

Additional notes:

1. No changes to Security Groups or IP Whitelisting has occurred.
2. Other users and workspaces have continued to function fine.
3. I also created a 2nd workspace for the same person (to verify it isn't overarching network/firewall issues) -- and they are able to connect just fine.

Also: My user has full global admin privileges and explicitly has all of the AmazonWorkspaces* policies attached.

Does anyone else have any helpful hints / tips before we write this workspace off and start over?

Neal