error in event detail for 2nd language

I have a multilanguage site with 2 languages.
I have a menu that is set for all languages and 3 events. All the events are for all languages.
In timeline view only the first one works. The other to go to 404 error page not found.
The 404 error is only on one of the languages. All the events have their translation right.
Am I missing something ? How can I fix it ?

Hello

As mentioned, please go to Events Booking -> Configuration, look at SEF Router Settings tab, set Insert Event ID parameter to Yes

Then check it again. If the error still happens, submit a support ticket sending us super admin account of your site and tell us step by step what we need to do to see the error. We are going to check to see why the issue happens and get it sorted

Regards,

Tuan