IoS Mail: only the default eMail can have a trusted cert

There is a thread on this... and it toke me hours to find what the problem was.

I too have aliases and have a cert for the main mail id and for one of the aliases. And indeed the cert shows as "not trusted" if the alias is not the one set as default.

The impact is that if I use a different alias to send eMail I have to change a few things in the settings - everytime.

Is this still a problem for others? or just me and I should have changed something somewhere?

MacOS has not the problem

Thread with the problem and explanation:

iOS Mail S/MIME cert installed and truste… - Apple Community