Error: "Could not find primary user" occurs when opening a specific email

[martgil]

Description:

On the FlowCrypt iOS app, when opening a specific encrypted + signed email, and error message saying Could not find primary user that pops up and prevents the user from reading the encrypted contents. It's basically the same issue that occurs on the FlowCrypt browser extension when opening such email, which was tracked via FlowCrypt/flowcrypt-browser#6147.

[sosnovsky]

Hi @martgil, what about Android app - how it handles such email message? Does it show error message or parse email without any errors?

[martgil]

In the FlowCrypt android app, it opens just fine where decrypted message was displayed with the warning message below regarding the invalid public key:

[martgil]

I have dug deeper into the problem, and I must say that the FlowCrypt Android app handles this specific scenario very well. This is indeed an issue with the OpenPGP key formatting, where the email is actually a MIME message that contains the public key. Based on this recent investigation, the behavior of the FlowCrypt browser extension in FlowCrypt/flowcrypt-browser#6147
is also accurate.

However, the FlowCrypt iOS app has the most impactful outcome, as it prevents users from reading the email when the problem occurs.

Do we need to update the error message to a more natural one? What we currently have may already be sufficient.