Can't delete VNET due to subnet

Question

Can't delete VNET due to subnet

Nutpapon Limsupavanich 20

Hi.

I did some provision testing for AI resources bicep and want to delete resources. I tried to delete the VNet and got this error.

Failed to delete virtual network 'agent-vnet-test'. Error: Subnet agent-subnet is in use by /subscriptions/xxxxx-xxxxx/resourceGroups/ai-private-infra-02/providers/Microsoft.Network/virtualNetworks/agent-vnet-test/subnets/agent-subnet/serviceAssociationLinks/legionservicelink and cannot be deleted. In order to delete the subnet, delete all the resources within the subnet. See aka.ms/deletesubnet.

Then, I tried to delete the subnet and remove delegation but also has this error.

Failed to delete subnet 'agent-subnet'. Error: Subnet agent-subnet is in use by /subscriptions/xxxxx-xxxxx/resourceGroups/ai-private-infra-02/providers/Microsoft.Network/virtualNetworks/agent-vnet-test/subnets/agent-subnet/serviceAssociationLinks/legionservicelink and cannot be deleted. In order to delete the subnet, delete all the resources within the subnet. See aka.ms/deletesubnet.

Failed to save subnet 'agent-subnet'. Error: 'Subnet /subscriptions/xxxxx-xxxxx/resourceGroups/ai-private-infra-02/providers/Microsoft.Network/virtualNetworks/agent-vnet-test/subnets/agent-subnet requires any of the following delegation(s) [Microsoft.App/environments] to reference service association link /subscriptions/xxxxx-xxxxx/resourceGroups/ai-private-infra-02/providers/Microsoft.Network/virtualNetworks/agent-vnet-test/subnets/agent-subnet/serviceAssociationLinks/legionservicelink. Those delegations are either missing or getting deleted from subnet.'

Please suggest me how to delete these resources.

Bests,

Kong

Venkatesan S 7,965 Reputation points Microsoft External Staff Moderator

2026-04-17T03:56:01.0166667+00:00

Hi Nutpapon Limsupavanich,

Thank you for contacting us about the Can't delete VNET due to subnet issue. We have begun looking into it and will share our suggestions with you as soon as possible. If you have any additional details or concerns in the meantime, please let us know. We appreciate your patience while we work on this.
Golla Venkata Pavani 4,095 Reputation points Microsoft External Staff Moderator

2026-04-20T16:43:11.8366667+00:00

Hello @Nutpapon Limsupavanich

I'm just reaching out to see if your issue has been resolved or if you've had a chance to review my previous comment?

Answer accepted by question author

0 additional answers

Your answer

Venkatesan S 7,965 Reputation points Microsoft External Staff Moderator

2026-04-17T03:56:01.0166667+00:00

Hi Nutpapon Limsupavanich,

Thank you for contacting us about the Can't delete VNET due to subnet issue. We have begun looking into it and will share our suggestions with you as soon as possible. If you have any additional details or concerns in the meantime, please let us know. We appreciate your patience while we work on this.
Golla Venkata Pavani 4,095 Reputation points Microsoft External Staff Moderator

2026-04-20T16:43:11.8366667+00:00

Hello @Nutpapon Limsupavanich

I'm just reaching out to see if your issue has been resolved or if you've had a chance to review my previous comment?

Answer 1

Hello @Nutpapon Limsupavanich

Thank you for reaching out Microsoft Q&A. Please could you let us know if you have checked the dependencies for the Vnet.

serviceAssociationLinks/legionservicelink

Regarding this, please use below purge command, it will take around 24 hours then you can go ahead and delete subnet.

az rest --method POST \ --uri "/subscriptions/<SUBSCRIPTION-ID>/providers/Microsoft.Web/locations/<LOCATION>/purgeUnusedVirtualNetworkIntegration?api-version=2024-04-01" \ --body "{'subnetResourceId': '<SUBNET-RESOURCE-ID>'}"

Replace the parameters with yours.

Share via

Can't delete VNET due to subnet

0 additional answers

Your answer