I am using Kagi Translate Chrome Extension (Chrome 146, latest) in MacOs 26.3.1
The Bug: Select text (Portuguese in may case) - Right Click - "Define With Kagi" - there is red 403 error.
Define language in options is in default position (nothing was changed in options)
Other items in selection menu working ok (translate,etc)
"Define With Kagi" works without 403 error