Catch all bird not working

I have made a default email and added the catchall bird addon to Thunderbird

Thunderbird but the catchall bounces the mail

any thoughts

There is a support site shiwn on the addon page: https://addons.thunderbird.net/en-GB/thunderbird/addon/catchall-bird/
You can raise a bug here: https://github.com/Jabb0/CatchAllBird/issues