@MalinE
Welcome to HP Support Forum. Please treat this as new router and use the following instructions to fix:
http://www8.hp.com/au/en/campaigns/wireless-printing-center/reconfiguring-system-help3.html
Please also note: Your printer may only support 2.4GHz therefore you need to check and allow your router to broadcast both (dual) bands which are 2.4GHz and 5.0GHz.
Regards.
BH***
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