Error 403 after introducing Authenticator Code

Hi. Since this morning y canot access my WordPress Dashboard using login with two factor. After putting user and password (enter) then putting the code from my Google Authenticator App the page says:

“Access denied!
Access to the requested object is not possible. Either it cannot be read by the server or it is access protected.
If you think this is a malfunction of the server, please inform the webmaster.
Error 403
mywebpage.com
Apache”
Deactivating “two-factor” via FTP helps. But I would like to go on using two-factor. What can I do to let it work again?
Thanks for any help ??