Unable to pair to MFA app

[tg90nor]

akr seems to generate a valid QR code, but it is not being picked up by the Akamai MFA app.

$ akr pair
...
Scan the above QR code to pair your device...
Error: Response was never received

$ akr --version
akr - Akamai Krypton 1.0

on x86_64 Arch Linux

Android app is Akamai MFA v1.10.0 (45)

Scanning the QR code with a third party scanner app I get a URL like https://mfa.akamai.com/#redacted