Unable to log in to Proton app on FP6+ Murena

Help Fairphone 6
,
1

Proton Mail app shows “Login credentials are incorrect” on Fairphone 6+ Murena, while the same login works perfectly on Fairphone 6 Murena and iPad.

Environment

- **Device**: Fairphone 6+ (Snapdragon 7s Gen 4, 12 GB RAM)

- **ROM**: Murena /e/OS

- **Application**: Proton Mail v7.11.5 (August 27, 2026)

- **DNS**: Quad9 (also works on FP6 with Quad9)

Problem Details

- Error message: “The login credentials are not correct. We invite you to try again.”

- Same account/password works flawlessly on:

  • Fairphone 6 (Snapdragon 7s Gen 3, 8 GB RAM) with Murena

  • iPad (iOS)

Troubleshooting Steps Attempted (All Failed)

- ✓ App updated to latest version

- ✓ Cleared cache and app data

- ✓ Complete uninstall/reinstall

- ✓ Changed DNS (Quad9 → Cloudflare)

- ✓ Enabled microG “Google device registration”

- ✓ Verified system date/time accuracy

- ✓ Granted all app permissions

- ✓ Battery optimization set to “Unrestricted”

Hypothesis

Bug specific to the cryptographic module of Snapdragon 7s Gen 4 under /e/OS, or microG incompatibility with this hardware architecture.

Request

- Investigation into compatibility with Fairphone 6+ /e/OS

- Workaround solution if available

- Notification when a fix is deployed

2

how would we FP user address this request? Here is the FP user forum, no contact to FP support, also your issue needs to be addressed rather in the e/OS forum as, Murena develops the system not FP.

3

I think it would have been nice to include the link to the topic on the /e/ forum you already created so that we don’t need to ask/suggest the same things twice. :wink:

And I saw you posted an additional bug report at Unable to log in to Proton Mail app on FP6+ Murena - User Queries - /e/OS community
As far as I know real bug reports to the /e/ support need to go through Work items · e / Backlog · GitLab

Just a wild guess: could it be that the proton services are kind of blocked by the default settings of /e/OS and you explicitly allowed them on the FP6 in the past but not yet on the FP6+? I mean, to my knowledge, the /e/OS image is the same for FP6 and FP6+ as is the app version (the versions are identical between the two Fairphones, right?). To me that sounds a bit like differences in settings. But as I said, just a wild guess.

Bug specific to the cryptographic module of Snapdragon 7s Gen 4 under /e/OS, or microG incompatibility with this hardware architecture.

That of course would also be an explanation. If that’s the root cause, I fear we users here won’t be able to assist.
I guess the best the people here in the Fairphone forum can do is to respond if Proton works with their FP6+ on stock ROM or if the same problem is present there, too.
Until then, I hope someone on /e/ side can help you. Or as suggested over there the Proton support.

4

possibly unrelated since I am on stock Android and on FP5, but I have the same version of the ProtonMail as a beta tester. Are you by any chance a beta tester for Proton as well?

5

FWIW - try logging in with the normal/administrative proton login, not the VPN login. Works for me since a long time, well before I got a FF6+/eos.

6

Proton apps work smoothly on the Fairphone 6 Murena

7

I managed to connect to all Proton apps by means of a QR code:

Sign in on another device How to connect with a QR code

1. Open any Proton app from the device you want to connect to.

2 On the login screen, select Password • Forgot or Login issues? (on mobile apps, select Help

3 Select Sign in with a QR code.

A QR • Code will appear.

4 On this device, tap Scan QR code and • Scan the code.