Init vars

# Proxmox related
export PROXMOX_VE_USERNAME=<user>
export PROXMOX_VE_PASSWORD=<password>
# OVH related
export OVH_APPLICATION_KEY=<application_key>
export OVH_APPLICATION_SECRET=<application_secret>
export OVH_CONSUMER_KEY=<consumer_key>
# Home related to store tfstate
export TF_VAR_HOME=${HOME}

Use

tofu init
tofu apply