Fenix: FNX2-16811 ⁃ Cannot login into slack app using Fenix

[agi90]

Steps to reproduce

• Try to login into slack from an non authenticated phone
• Complete dual authentication auth0 steps on phone

Expected behavior

Control is given back to Slack and login is successful.

Actual behavior

Fenix gets stuck on a white page after dual auth is completed.

• Android device: Samsung S10e
• Fenix version: 1.0.1913

[agi90]

[vesta0]

This could be caused by Tracking Protection. Will verify once tracking protection feature landed.

[kbrosnan]

Works for me using April 25th build and request desktop site on a Pixel 3. Request desktop site is required to bypass the Slack app download redirect.

[agi90]

This is still broken for me (and works on other browsers like Chrome)

Note for STR:

• Logout from Slack app
• Login again
• Select Auth0 (this opens Fenix if it's your default browser)
• Log in
• White page (instead of getting back to Slack app)

[jonalmeida]

This is _might_ be the app not having intent handling to external apps: https://github.com/mozilla-mobile/android-components/issues/1132

[kbrosnan]

I thought you were trying to use the web version of Slack on Fenix.

[agi90]

I want to add that this is especially frustrating because users have to change the default browser to unblock themselves, I wouldn't even expect most users to even know how to get there from the settings.

[vesta0]

Thanks @agi90. We have prioritized the related A-C issue.

[bifleming]

@kbrosnan can you re-test now that the applink work has landed?

[jonalmeida]

In our sprint planning I said I would re-test this since I still had the issue showing up. There was a crash issue that was in the way of testing it yesterday itself.

I retested this now and I still see the blank screen after logging in without being redirected to the Slack app.

Device: Pixel 2, Android 9.

cc: @jhugman

[jhugman]

Thanks, @jonalmeida : I'll take a look.

[sv-ohorvath]

Verified I can now login to Slack using Fenix default browser. Build: 6/11. Devices: HTC Desire 820 (Android 6.0.1), Pixel (Android 9)

[sblatz]

Re-opening per: https://github.com/mozilla-mobile/fenix/issues/3528#issuecomment-503630172

[jhugman]

This is blocked on re-enabling app-links for custom schemes and intents.

[sblatz]

I believe this we re-enabled by @jhugman? https://github.com/mozilla-mobile/fenix/pull/4117

[sv-ohorvath]

Can now login into Slack using Fenix Nightly 190724 Build #12050609.