Why did the secret key change?

Question

Classmates

I have an authorization system through social networks on my site, and not so long ago this option stopped working. I need to go to the application settings on the ok.ru website and make changes, but I can’t get into the application settings, it tells me that the code is not correct, although this is excluded, because the code did not change after registration and after that it worked successfully, but recently suddenly stopped. What should I do to recover my code? I need to go to settings!