Some obvious things to try are; Make sure you're on the same network, reboot/reset the printer and router, reinstall the plugin and make sure it is the correct plugin for your application, reset the Ultra's network settings and contact HP tech support.
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Bill --- Galaxy Fold 6 512g(VZW), Galaxy Book (original, VZW), Tab S8 Ultra, Tab S4, Galaxy Watch7Ultra(VZW),Galaxy Watch6Classic 47mm(VZW), M8 Smart Monitor, NEO 55" QN90D TV, Buds Pro
Just an FYI. I hadn't had the need to print so when I saw this post I first tried to connect to my WiFi Brother printer and it was not found. I then loaded the Brother Print Service Plugin and the printer was immediately found and I printed to it. So printing does work from the S21.
** If my response helps, please click on Like (Heart). If I resolved your issue also please click on Accept as a Solution so that others can benefit.
Bill --- Galaxy Fold 6 512g(VZW), Galaxy Book (original, VZW), Tab S8 Ultra, Tab S4, Galaxy Watch7Ultra(VZW),Galaxy Watch6Classic 47mm(VZW), M8 Smart Monitor, NEO 55" QN90D TV, Buds Pro
