Isn’t solved yet, as the Seahorse gui is broken right now, you can remove the keyring and start again doing this:
Open the terminal and type rm /home/purism/.local/share/keyrings/Default_keyring.keyring then open Geary and you will be prompted to add the email account password again, then the keyring one, try to use one that you can remember.
If you can connect the phone to a monitor and keyboard and mouse you can change the password easily with Seahorse.