I'm having the same problem with my HP All in One printers. I have 2, different ages, having this issue only after installing the Xfinity modem. Did you ever find a fix?
Does anyone have a fix???? I have tried pretty much everything I can think of. Installed a new driver, though when I looked at the date of the driver it was Oct, 2019 and I am sure I had the most current driver since my MAC is new in 2020. I reconnected the printer to the network, I see the printer on my MAC (it even tells me it is low on blue ink so I know it is connecting) but when I go to print I get a "printer not responding" error. This has only started happening since we got a new modem/router from Xfinity 2 weeks ago. We had an older one from Xfinity previously so I am stumped as to where the issue is. I printed the report showing the printer is conntected to the wireless network, the same one as the MAC. I tried to follow instructions from a different older thread about showing the printer's webpage but it does not load so I got stuck with that suggestion. VERY FRUSTRATED!