"Profile - Register" auto action

Hello

There are some questions regarding the "Profile - Register" auto action.
It has the default settings (as it was set on previous versions that used system auto actions).

My first question:
Edit Auto Action / Action TAB / Title field -> has no effect at all! Tested entering a title, tested entering a language key... but the result is always the same! All activities created by this auto action have the same string at the right of username. The language string with key "JOINED_THE_SITE_16fbb7".
Am i doing something wrong?

Second question, same auto action:
Is there a way to group the activity posts that are created by this auto action, according to a cb field?
Example...
2 new users register as doctors. For these 2 new users, the created by an auto action activity to have the title 2 new doctors joined the platform".
2 new users register as nursing staff. For these 2 new users, the created by the other auto action activity to have the title 2 new nursing staff members joined the platform".
etc...

Thank you in advance...

Edit Auto Action / Action TAB / Title field -> has no effect at all! Tested entering a title, tested entering a language key... but the result is always the same! All activities created by this auto action have the same string at the right of username. The language string with key "JOINED_THE_SITE_16fbb7".
Am i doing something wrong?

The asset you're using has a core verb in it, which overrides the title with a specific one. So setting a title from your auto action does save it, but it won't be applied.

Is there a way to group the activity posts that are created by this auto action, according to a cb field?

No, grouping is done by Asset.