When you add your printer to an HP Connected account, you might see an Invalid Code message when using an invalid Printer Code, or if the printer is already claimed by another HP Connected account.
Make sure your printer has not already been added to another HP Connected account.
If the printer is not connected to another account, print another Print Info Page to generate a new Printer Code, and then try to add the printer again.
If the printer is connected to another account, you can either remove it from that account and then add it to your account, or you can use the credentials of the other account when you sign into the HP Smart app.
You need of any our Technical Support agent. Please call Technical Support team at +44 203 880 7918 our experts are available 24/7 by phone.
More Info - https://printercontactsupport.co.uk/