Hi,
I have/had the same issue. I created a new self-signed certificate which helped my windows machines but MacOS was still reporting a certificate error even after resetting the printing system and reinstalling the printer. I wasn't happy with one solution I found which entailed installing the printer as a "Generic PCL Device" since then it needed to be installed 2 times (again as a scanner) in order to access the scan function. I dug around a little and disabled the encryption on IPP (IPPS) and was then able to install the Smart Tank using Bonjour protocol once again.
I don't consider this a fix, only a workaround and hopefully this will be sorted soon
hopefully this helps someone