Latest version of element in app store can't login get M_UNRECOGNIZED error

[brendanheywood]

Steps to reproduce

Around a week ago logins started to fail, presumably with an auto update. After being asked to re-login again it opens a webview popup which connects to our home server and then shows this error:

{"errcode": "M_UNRECOGNIZED", "error": "Unrecognized request"}

At first we thought it was something with our homeserver or our SSO but when attempting to connect to matrix.org we get the same error. It seems everyone in our organisation is getting the same error.

We have trialed using the Syphon iphone mobile app which does correctly connect (but the app seem beta quality) so it isn't an issue with our server or SSO.

What happened?

What did you expect?

Be prompted with the normal SSO login for our home server

What happened?

{"errcode": "M_UNRECOGNIZED", "error": "Unrecognized request"}

Your phone model

iPhone 11

Operating system version

ios 14.71

Application version

1.5.1

Homeserver

chat.catalyst-au.net

Have you submitted a rageshake?

No -Tried but could not get this to work

[grantm]

Just noting that when this failure happens we see this in the homeserver.log:

"GET /_matrix/client/r0/login/sso/redirect/?redirectUrl=element://connect?transaction_id%3Dm1554409636.1 HTTP/1.0"

Compared to a successful login via a web client:

"GET /_matrix/client/r0/login/sso/redirect?redirectUrl=https%3A%2F%2Fstaging.chat.catalyst.net.nz%2F%23%2F HTTP/1.0"

The key difference seems to be the trailing '/' on the URL path.

[pengufrost]

Noting that the change to Riot/Modules/Authentication/SSO/SSOURLConstants.swift is very likely the cause of this issue