Azure Databricks "Failed to prepare subnet" - azure-devops

Question

We are injecting Databricks into a VNet subnet through our Bicep deployment.
Intermittently, we are seeing the error:
{"code":"PrepareSubnetError","message":"Failed to prepare subnet 'DataBricksPrivateSubnet'. Please try again later. Error details: 'Failed to prepare subnet 'DataBricksPrivateSubnet'. Please try again later'"}
Trying again later does usually work, but is not a very satisfactory solution.
Some extracts from our Biep templates:
resource virtualNetwork 'Microsoft.Network/virtualNetworks#2019-11-01' = {
properties: {
subnets: [
{
name: 'DataBricksPublicSubnet'
properties: {
delegations: [
{
name: 'DataBricksPublicSubnetDelegation'
properties: {
serviceName: 'Microsoft.Databricks/workspaces'
}
}
]
}
}
{
name: 'DataBricksPrivateSubnet'
properties: {
delegations: [
{
name: 'DataBricksPrivateSubnetDelegation'
properties: {
serviceName: 'Microsoft.Databricks/workspaces'
}
}
]
}
}
]
}
}
resource ws 'Microsoft.Databricks/workspaces#2018-04-01' = {
properties: {
parameters: {
customPublicSubnetName: {
value: 'DataBricksPublicSubnet'
}
customPrivateSubnetName: {
value: 'DataBricksPrivateSubnet'
}
}
}
}