I see that we can enable TLS version only during IoT Hub
creation in Azure
portal.How do we change this version POST creation? we have already deployed in PRODUCTION and now we need to change it.
Unfortunately, you can't. There is no option in the portal for this, and it can't be achieved through ARM either. Trying it with ARM will result in the following error:
MinTlsVersion cannot be set when IotHub is in Active state
The documentation confirms that this field is read-only and can't be changed.