You assigned a permission for players or groups?
To assign a permission, use oxide.grant <user or group> <name or steam id> <permission>.
To remove a permission, use oxide.revoke <user or group> <name or steam id> <permission>.
hwteleportation.admin -- for admin commands (/tp & /tphere & /setwarp & /removewarp)
hwteleportation.tpr -- for teleport request commands (/tpr & /tpa)
hwteleportation.home -- for home commands (/home, /sethome, /removehome & /homes)
hwteleportation.warp -- for warp commands (/warp & /warps)