Hi, yes, this is normal. 2-step verification must be active in order to use YouTube studio. Since the seller activates 2 step verification with his own phone number, the codes are sent to the seller's phone number. replace the phone number of the 2 step verification with your own number. If a rescue phone has been added, replace the rescue phone with your own phone if a rescue phone has not been added, add your own phone number as a rescue phone. 7 Days after changing this information(7 days must be fully completed.) the codes will start to be sent to your phone number. After the channel's AdSense account has been changed, you need to wait 32 days when you want to change the channel's AdSense account again. If it has been 32 days since the channel's AdSense account was changed, you can associate the AdSense account with the channel.
