Oauth2 cannot delete an entry

Good morning,
I have a problem with the oauth2 module.
I had started a configuration of the module without managing to make it work.
In the meantime, I migrated my server to a new hosting platform using the backup and restore method.
Unfortunately, now when I want to delete or modify my old entry, I systematically receive the same error.

localhost refused the connection.
ERR_CONNECTION_REFUSED

On the other hand I can create and delete a new entry without problem with different ID and token.
But if I put the same ID and token, I can no longer delete the new entry.

Can you help me remove blocking entries?

Thanks in advance and have a nice day everyone

Nicolouts