Optimize cost of SQL Managed Instances with new stop-start capability

NikoNeugebauer Doing exactly that with a Dev/Test subscription, and all Regions are still showing under the "Other" category.
And once the filter is toggled to show only those compatible with the feature wave, no regions at all appear on the list. The subscription, however, remains visible in the subscription list under "Ready for November 2022 feature wave".
Is there a specific resource provider that might be missing and would need to be manually registered for the subscription to get this new feature working, or should Microsoft.Sql provider be removed and re-added to pick up latest? - Any advice or pointer would be greatly appreciated as we're completely stuck.

EDIT: This is what I noticed in the API calls made by the portal while trying to select a region (with the filter toggle being off)

Any idea why the default Subnet and VCore quotas for a Dev/Test subscription would be zero? - Aren't they supposed to be 6 and 320, respectively?

EDIT2: Quotas increased using a support request, and I'm now able to select the intended region when the toggle is off, but still no regions will be listed as compatible with the feature wave.