Detaching a VPC from a TGW
To detach a VPC from an AWS Transit Gateway:
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Go to Aviatrix CoPilot > Networking > Connectivity > select the AWS TGW tab > select an existing AWS TGW. 
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Select the Attachments tab. 
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Select the VPC tab. 
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Find the attached VPC in the table and click the Detach icon. 
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Click Remove. 
The detachment begins. To view the task’s progress, go to Monitor > Notifications > select the Tasks tab.