Hi @Anonymous ,
We will not be able to see the connection under the ExpressRoute Circuit Connections page if the connected Vnet Gateway is in a different subscription.
However, we can check the connection status from the Gateway side via Portal or PowerShell
https://learn.microsoft.com/en-us/powershell/module/az.network/get-azexpressrouteconnection?view=azps-8.1.0
Thanks,
Kapil
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