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Azure Portal - Migrate to ARM - Failed during prepare step

Kenneth Moens 1 Reputation point
2021-07-28T13:50:17.58+00:00

We are trying to upgrade from ASM to ARM (Virtual Network) via the Azure Portal.

  1. Step 1 - validating is working fine.
  2. Step 2 - gives an error (See screenshot).

I have no idea in which direction to look for since the error message is not clear to me.
Anyone who can help me out ?

Thank you in advance!

Azure Virtual Network
Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
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  1. TravisCragg-MSFT 5,681 Reputation points Microsoft Employee
    2021-08-03T19:28:52.37+00:00

    Typically this error is due to an unsupported deployment for migration inside the virtual network. Please review the unsupported migration doc and make sure that your classic virtual network is able to be migrated.

    Many services will give this error, such as an ExpressRoute, VNET Peering, Application gateway, ect. Normally the error will list the configuration that is not supported, but there appears to be an issue with the error reporting at the moment.

    If you need further assistance in getting your VNET migrated, your best bet will be to follow up with Azure Support so that they can take a deeper look at your VNET. If you do not have a support plan to create a support request, please let me know.

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