Installed the updated application, and it worked perfectly from ESXi to PVE 9.1. No issues logging into either the ESXi or PVE hosts.

Thank you so much!

I have this exact issue. I’ve tried with both a Proxmox 8.4 and 9.1 host, same issue, ‘failed to parse JSON response’. Works fine from an ESXi host a HyperV host. Might it be anything to do with having a specific version of JavaScript installed?