The contacts bit is a disaster right now, there is a whole support page devoted to it and it still does not tell the whole story. https://support.signal.org/hc/

The contacts bit is a disaster right now, there is a whole support page devoted to it and it still does not tell the whole story. https://support.signal.org/hc/en-us/articles/360007319011-Manage-Contacts https://support.signal.org/hc/en-us/articles/360007319011-Ma... I had a contact show up with a super old name that I wanted to update but it was right in all my other apps. Turns out I still had the old name in one of the read only merged contacts from WhatsApp (contact showed up fine in WhatsApp). I had to remove my WhatsApp account clear the app data for signal and resync everything.