At the end it was written that, after exit i can see my certificate
First of all, CONGRATULATIONS!!
Passing L1 is awesome. Way to go.
After you finish the exam you must fill out the survey. Then the link to create the certificate will become available.
When I took L1 it was with the classic version. It might be different with the New UX but I'm assuming its the same. Check to make sure you've filled out the survey.
If you have and the link is still locked, give firstname.lastname@example.org a note. They'll make it right.
Again, congratulations!! Really great to see.