Trello App-only login issue

[Stefanie Bowles]

My Trello app logged me out a few months ago and I’ve not been able to get back in since. I’m using it a lot and it’s really frustrating that it won’t work on my phone now.

It is not an issue with my account - I can log in on any other device just fine. I can log in via the browser on my phone, just fine. It is only the app that is not working.

I have tried updating the app, and removing/reinstalling the app - none of this has worked. The error I am getting is as follows:

“something went wrong while attempting to validate your credentials”

I have also tried the “can’t login” button, but this takes me to a password reset that also does not work - only on the app!

It’s starting to get really frustrating and I can’t get a hold of Trello as I’m not entitled to one-on-one support. The “app support” button on the App Store asks me to login to the app, so I cannot get information from there either.

Does anyone know the issue? Or know who I can reach out to?

app version is: 2025.4

phone system: iOS 18.3.1

(However I will note that the issue has spanned different app and phone versions).

[Erick Doerre]

Hello Stefanie,

I'm sorry to hear about this issue on your app. I'm glad to help you!

Usually, this error is related to Safari blocking cookies on your iPhone. To fix this:

ON Safari

- Open the Settings app, scroll down, and select Safari.
- Under Privacy & Security, make sure Block All Cookies is turned off.
- You may need to restart Safari for these settings to take effect.

Check Apple’s documentation for more about cookies in Safari.

I hope it helps. Let me know that goes!