It works To do it on the smartphone with fingers is a little bit fiddly. Then I used the end of pencil with a kind of rubber, than it was easer Thanks again!

@projectmoon I installed the package qtubuntu-qt6 provided by Ubports into my bundle, the same that is used in Morph Qt6 version.

This issue had to do with signalcaptcha not working correctly so I was never verified account (that's why message not delivered). Fix was not use Brave Browser (ad blocking), DNS flush and turn off VPN. Then signalcaptcha worked, properly verified and now it is working. I'll leave this info here just in case others encounter this issue.