We are trying to upgrade from ASM to ARM (Virtual Network) via the Azure Portal.
Step 1 - validating is working fine.
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!
[1]: https://i.stack.imgur.com/cwQ9h.png