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That is very likely a codegen bug... Which resource are you trying set the property on because it should probably be typed as

Input[str | None]

It’s

azure-native > network.ARecordArgs

here: https://github.com/pulumi/pulumi-azure-native/blob/master/sdk/python/pulumi_azure_native/network/_inputs.py#L298. The type hint is

ipv4_address: Optional[pulumi.Input[str]]

which gets interpreted as

Input[str] | None

.

Yup thanks that's a bug in the code generator, I thought we already had a bug report for that but I can't find it now. I'll double check again and get an issue raised for this, should be a very quick fix.