I cant login into battlenet post the update

‘‘There was an error handling the request’’
This is the message that pops up on my screen when i use my mail and password to log into battlenet WC3 Frozen Throne post the update. Anyone able to help?

Thanks in advance

Do you have your RoC game key linked to your Battlenet account? That’s needed to play the Classic mode of the Reforged update. See here to link it: