Unable to start spark session

My issue magically disappeared overnight and all notebooks are working now, however my org can't tolerate 24 hours downtime. I've also opened a ticket.

I've found that very similar problem in Azure Synapse Notebooks can be fixed by re-creating the spark pool, and looks like that's what resizing does

Also having the same issue. Has affected all notebooks a given workspace seemingly at random. Today I migrated code to a new workspace that didn't have the issue to do edits and was able to work with it all day......up until it suddenly decided to generate the same error as of the EOD. I've yet to resolve it in any workspaces that 

This is kind of a showstopper for me -- the only saving grace is that for me it's not interrupting a business dependent process. But it's near completly stopped my development on a project that's dependent on Fabric notebooks (and migrating work to different workspaces is difficult due to deployment pipelines not supporting all objects). Submitted a ticket and apparently the product group is working on it, but this is a really, really, bad one in that it's stopped work and doesn't seem to have a functional work around other than make a new workspace, migrate, and pray.

Out of Preview, eh? Just let me have a dedicated compute instance like in AML pretty please. At least as a backup.