Reconnecting the application has a problem ("short name" is already taken), what to do?

Question

Classmates

Greetings!
I'm trying to connect Social Login from oneall.com the
first attempt was unsuccessful due to a mismatch in the email in the OK profile and I deleted the profile from oneall.com
, created a new one (I had to contact technical support)
now the problem is that when creating a new application
they write that it is short the name is already taken (I'm attaching a picture),
what should I do?
I can’t change it for oneall, what is it
about:
https://apiok.ru/wiki/pages/viewpage.action;jsessi...
Many thanks in advance