have you turned of smart setup
https://www.bt.com/help/broadband/what-is-smart-setup-on-the-bt-hub--how-can-i-turn-it-on-and-off-
have you split the networks
https://www.bt.com/help/broadband/fix-a-problem/broadband-and-wi-fi/i-want-to-improve-my-wi-fi/how-d...
then try factory reset printer.
now try and connect to the 2.4ghz network which if you split as above should have a different SSID to the 5ghz
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