recaptcha public and private keys saved in settings tab dont work

[DPTOProgramacionIslaNetworks]

Hi, i have the abwebdevelopers form plugin on octobercms v2 and im having isues with recaptcha
i set on the settings menu the public and private keys of the google v2 recaptcha and it doesnt seem to work
i get an issue that says that this domain key is not valid

thanks in advance