The authorization flow opens the linkedin app and never returns to the callback url (IPHONE)

[Lastimoso]

Problem
When trying to sign_up/login from an Iphone it opens the linkedin app and do nothing else. Same thing using Chrome and Safari. On the contrary, it works perfectly:

• When on desktop
• If the linkedin app is not installed in the iphone
• If we use an incognito browser in the iphone (either Safari or Chrome)

Context

• In my logs I see Started POST "/users/auth/linkedin" for IP. DEBUG -- omniauth: (linkedin) Request phase initiated. and nothing else.
• I've disabled Turbo and even javascript but the issue remains.
• Same thing is happening in development, staging and production.
• I tried debugging in safari to see if I saw a clue in network or even console logs, but nothing. Any ideas?
• and Ruby 3.0.1

More context

• I tried using rails redirection to the url https://www.linkedin.com/oauth/v2/authorization?all_the_needed parameters and works as expected.
• The Gem is actually creating the Rack response correctly.
• I tried changing the status of the rack response to 303 or 302 but the issue remains.

Stack

• Rails (6.1.3.2)
• Ruby (3.0.1)
• Rack (2.2.3)
• omniauth (2.0.4)
• oauth2 (1.4.7)
• omniauth-linkedin-oauth2 (1.0.0)
• Devise (4.8.0)

Any Idea? I looked very hard trying to find people reporting this issue but without any luck. I start to think that may be related to my ruby or rails version but haven't check. Both apps use same stack...

[Lastimoso]

Apparently, Linkedin already confirmed this is an issue on their side. I spent several days debugging this! 😱