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Pulumi SDK versions are:
```<http://github.com/pulumi/pulumi-azure/sdk/v3|github.com/pulumi/pulumi-azure/sdk/v3> v3.50.0
<http://github.com/pulumi/pulumi-azuread/sdk/v3|github.com/pulumi/pulumi-azuread/sdk/v3> v3.4.0
<http://github.com/pulumi/pulumi-azuredevops/sdk|github.com/pulumi/pulumi-azuredevops/sdk> v1.2.2
<http://github.com/pulumi/pulumi-random/sdk/v3|github.com/pulumi/pulumi-random/sdk/v3> v3.0.3
<http://github.com/pulumi/pulumi/sdk/v2|github.com/pulumi/pulumi/sdk/v2> v2.22.0```

Ok, reading this comment helped (<https://github.com/pulumi/pulumi/issues/4930#issuecomment-651942736>). It was a wrong export: `defer ctx.Export(exports.SubnetID, vnet)` instead of `defer ctx.Export(exports.SubnetID, sn.ID())` . `vnet` is of course `*network.VirtualNetwork`