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This usually means that the parent resource does not exist. Are you specifying the parent names correctly? You can also run

pulumi up --debug -v=9 --logtostderr --logflow --yes --skip-preview

to log raw HTTP requests and see the actual URL that causes the error.

percentComplete":1.0,"properties":{"OperationKind":"DatabaseScriptCreateOrUpdate","RootActivityId"

:"GUID","provisioningState":"Succeeded","OperationState":"Completed"}} then it tries to get the operationsresults and gets an empty body and then it tries to get https://management.azure.com/subscriptions/someId/resourceGroups/devRg/providers/Micros[…]atabases/devDb/scripts/kustoScript1?api-version=2021-01-01 which result in an 404

Could you open an issue and attach those logs there (and a repro, ideally)? That would be very helpful.