Hello @Josh Basquez ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
I understand that you are unable to delete a subnet after removing app service and getting a "subnet is in use by serviceAssociationLinks" error.
As you already reached out to us via email, we suggested you try the below workaround:
You tried the workaround, but the issue persisted and since you didn't have a support plan, we enabled a one-time free support ticket for your issue.
The support team investigated the issue and suggested the next steps for resolution.
Kindly let us know if you need further assistance on this issue.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.