Can't sign in my google account

[sgn15]

Windows 10 64-bit
Version 62.0.3250.0 (Official Build) (64-bit)

I need my bookmarks, passwords, etc. and I can't successfully sign in from the settings sign in (to sync all my stuff).

This is the message that appears after I input my password

Error
Sorry, there seems to be a problem. Please try again.

I tried signing in on Iron browser itself, I successfully signed in using the SAME GOOGLE ACCOUNT to check my EMAIL.

I also tried signing in using google chrome settings and also managed to do so (retrieving passwords, bookmarks, etc.) so the issue is really with Iron.

How to fix this? Please reply ASAP. Thanks.

[sgn15]

No reply?

I have tried downloading/installing older versions of Iron and still can't log in my google account for syncing.

Just for curiosity's sake, I also tried another browser called Flashpeak Slimjet, I also CANNOT SIGN IN.

signed in just fine with google chrome but I prefer Iron.

Is this issue about Iron or this is a restriction of google to disallow signing in from anything other than google chrome?

Can someone with knowledgeable background please comment here the reason and/or solution to the problem?