Captcha always invalid

[kjcole]

I keep following the directions (every few months) for Registration with captcha and it always goes the same way.

I've tried with both
https://signalcaptchas.org/registration/generate.html and https://signalcaptchas.org/challenge/generate.html

I then open the link it directs me to, which produces a QR code. Using CoBang I extract the link:
sgnl://linkdevice?uuid=...%3D%3D&pub_key=...%2B...&capabilities="

(It always looks unfinished or truncated to me, with that = hanging out at the end...)

I then issue the command:
$ flatpak run org.asamk.SignalCli -a +1... register --reregister --captcha "sgnl://linkdevice?uuid=..."

and get Invalid captcha given. Without the --reregister I'm told Account already registered.

[AsamK]

The sgnl://linkdevice? is from the QR code to link a device to an existing one. Not for registration.
The https://signalcaptchas.org/registration/generate.html site gives you a link like signalcaptcha://signal-hcaptcha....

After filling the captcha, the site doesn't immediately show the token but tries to redirect to a signalcaptcha:// url that contains the token.
- After a short moment, a link will appear underneath the captcha called "Open Signal".
- Get the token by right clicking on it and clicking: copy url. You can paste that directly into: