Error: INTERNAL ASSERTION FAILED: Pending promise was never set

[jonathon-love]

[REQUIRED] Describe your environment

• Operating System version: Ubuntu 20.04
• Browser version: numerous
• Firebase UI version: 6.0.1
• Firebase SDK version: numerous

[REQUIRED] Describe the problem

when using the web demo (the demo from this repo), logging in using the microsoft login provider does not complete correctly. the signInSuccessWithAuthResult() callback is never called. instead an error is thrown:

Error: INTERNAL ASSERTION FAILED: Pending promise was never set

[jonathon-love]

here's the problem occuring with the project's online demo:

https://youtu.be/sK7IctXsDC4

in the firebaseui demo, onAuthEvent() is never called. however, if you run the firebase quickstart microsoft demo, that same error is thrown, however the onAuthEvent() is called. see here:

https://youtu.be/pRidN38YQps

i'll add that the firebaseui-web sometimes does work ... often the first time i interact with it, it "just works", but in any sort of log back out, open a private window, try again, testing dev workflow ... it stops working. you see this in the js quickstart demo ... the first time i try it, it works, but the second time it fails. this error is more common in firefox too ... i still do get it to happen in chrome though.

[lisajian]

Hi, thanks for filing this issue! We are unable to promise any timeline for this, but if others also have this issue, adding a +1 on this issue can help us prioritize adding this to the roadmap.

(Googler-only internal tracking bug: b/228618898)

[ArturVRSampaio]

+1

[dropmann]

+1

[jonathon-love]

hi,

i think it's important for the firebaseui project to be more upfront about this limitation ... that the microsoft login only works intermittently ... i think many people will see the promise of firebaseui -- a project that allows easy log in to all providers -- as compelling, invest the hours into incorporating it into their project, only to find that it doesn't live up to that promise.

the caveat that it doesn't really work with microsoft log in needs to be front and center in the documentation, along with communicating that addressing this short-coming isn't really a priority:

We are unable to promise any timeline for this

we would never have spent the time incorporating firebaseui had we understood this limitation.

[jamesdaniels]

FWIW I'm not able to reproduce in Chrome v100, MacOS. What flavor of microsoft accounts are you experiencing this with?

[jonathon-love]

i just reproduced (first attempt) using one of those @outlook.com accounts ... i think it's more common in ff than chrome, but i've definitely seen it in chrome.

[Sydney-o9]

+1. This happens for me in Firefox - login with Facebook.

[MuhammadM1998]

+1 in Firefox

[aizaiz]

+1 in chrome mobile version 101.0.4951

[9jaGuy]

+1