Warning: Undefined array key "mfaEnrollmentId"

[guillaumesmo]

Describe the bug

When 2FA is enabled in Firebase Auth, and a user has enrolled a 2FA method, Auth::listUsers and Auth::getUser throw the following exception

ErrorException: "Warning: Undefined array key "mfaEnrollmentId"" at .../vendor/kreait/firebase-php/src/Firebase/Auth/MfaInfo.php line 42

this seems to be caused by the API returning an array of MfaInfo, while the php lib expects only one

I was able to fix with the following changes:
7.x...guillaumesmo:firebase-php:7.x

Installed packages

"kreait/firebase-php": "^7.0",

### PHP version and extensions

```shell
php                    8.2.3

Steps to reproduce the issue.

$auth->getUser($userId);

Error message/Stack trace

ErrorException: "Warning: Undefined array key "mfaEnrollmentId"" at .../vendor/kreait/firebase-php/src/Firebase/Auth/MfaInfo.php line 42

Additional information

No response

[jeromegamez]

Thanks for reporting this - I had implemented this to resolve #749, but I wasn't able to test this properly (and @jesperbjerke, who requested it, might not have either 😅).

As far as I can see (from my phone) I can/would not change the existing property as it would be a breaking change, and introduce a new property instead (perhaps mfaEnrollments).

Can I rely on you properly testing this for me once I create the according PR? 🙏🏻

[guillaumesmo]

Firebase supports only phone MFA, so I don't think it's needed to add another property for now as it will only contain the single item which is already there. Instead the property can be passed the only item if present, or null

And yes, I'm able to test this for you

[jeromegamez]

Could you give #784 a try?

[guillaumesmo]

Hello,

tested:

kreait/firebase-php                   dev-mfa-info 21b918b

works as expected!

thank you very much

[jeromegamez]

Thank you 🙏🏻! I will then hopefully merge and release it later this evening, tomorrow at latest!

[jeromegamez]

Fixed with 8d82198

[guillaumesmo]

Thank you for the fix. Awesome package!