422 error on sign in - Morph Browser, Ubuntu Touch devices

No longer able to sign in to gitlab,com on Ubuntu Touch devices using the Morph Browser. Stopped about two weeks ago, no issues before then. I would expect it to take me in when email and password put in but takes me to a 422 error screen instead. Works fine on other devices and browsers. Tried repeatedly on OnePlus One and Raspberry Pi running Ubuntu Touch.
I can access gitlab.com to browse as the issue arises only when trying to sign in.

Error 422
Version - Using Gitlab.com

Troubleshooting - Asked on UBports Telegram groups if anyone else is also having this issue - confirmed. Suspect recent Gitlab update now requiring something not (yet) available in the Morph Browser but no idea what.