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The error message you received suggests that you have exceeded the regional quota limit for the networkconnections resource type in your Azure subscription. This means that you cannot create any more networkconnections resources until you delete some existing ones.
You can check the current usage and quota limits for your subscription by going to the Azure portal and navigating to the Subscription page. From there, you can view the usage and quota limits for all resource types, including networkconnections.
To request a quota increase, go to the Azure Support page and open a new support ticket. In the ticket, specify the resource type (networkconnections) and the region where you want to increase the quota.