Otto Helweg I have not been able to replace this on the *nix side. Will be testing on the windows end in the coming weeks.
Peter Tierno I have exact same error with Vault KV version 2 secrets storage. Seems that plugin is not supporting V2 storage well.
V2 Rest API was changed:
GET /secret/data/:path
Notice data path segment. Also, they changed response JSON.
Fixed in newer version of plugin