Support from IMDSv2 on ProxySG on AWS.
ProxySG hosted on AWS
Support for IMDSv2 has been added starting 7.4.9.1. Refer here
For existing proxysg instance, after changing the IMDS version from v1 to v2, a reboot is required.
For existing instances, you can do the following:
Amazon EC2 console: On the Instances page, select your instance, choose Actions, Instance settings, Modify instance metadata options, and for IMDSv2, choose Required. For more information, see Require the use of IMDSv2.
AWS CLI: Use the modify-instance-metadata-options CLI command to specify that only IMDSv2 is to be used.
Refer AWS documentation for more details