hello,
I have this problem : new users are unable to register on user interface: the register form shows normally but when I try to fill for a new registration it redirect me to the Login page and after I confirm the login, it is showing the following message "incorrect username or password. Please try again" even if the username is correct . Everything is fine on the backend (I can create new user). 
Can anyone help me please 
 

I use Joomla 4.2.7 and Community Builder version 2.8.0+build.2023.01.27.16.59.55.3636e2d5a
Thank you !

Thank you for your response. No I didn't any of CBs default menu items created when CB is installed nor create new menu items to CB. I have just create a menu on the site (Front) with the CB Registration Form (with the link : index.php?option=com_comprofiler&view=registers). All the CB default menu are published and are public.
 

Sorry, there was a typing error on my last message, so I correct it here :
Thank you for your response. No, I didn't modify any of CBs default menu items created when CB is installed nor create new menu items to CB. I have just created a menu on the site (Front) with the CB Registration Form (with the link : index.php?option=com_comprofiler&view=registers). I verified all the CB default menu, and they're all published and are public. But the registration still doesn't work. 

I have verified it deeply, and you were right, maybe one month ago I accidentally unpublished the CB sign-up menu. And now I have published it, but it is still unable to register. What else can I do to fix it? Thank you in advance for your response.