well then, try to change the network protocol to ipv4 only
you need to get the ip address of the printer first, then open any web browser and then try to type the ip address of the printer on the url, after that go to network tab > networking > network protocol > check on ipv4 only > apply
if that doesnt work.
try to go to the web services menu and remove the web services and then enable it back again.
ps: it will remove the ePrint address of your printer, you can no longer use the same email address of the printer, if you customize it.