I'm not sure of the issue here -- I see the same behavior in both videos?

C#2>>

1)In 'Sign out' screen -> enter wrong password  -> Error message is seen -> able to click on 'Learn more' link for first Wrong message 
2)Now again enter wrong password for 2nd time -> Error message is seen -> try to click on 'Learn more' link available at  Error message and observe 'Help' overlay is not seen
(Please refer Video and Screenshot)

Thanks..!!

<Bulk edit> Reminder M71 Stable is approaching. Please review this bug and assess if this is indeed a RBS. If not, please remove the RBS label. If so, please make sure any planned work will be tested in Beta and verified before the Stable date. Thanks

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/29fa932b58e2ef571a93c04291300e58a1ab1ec2

commit 29fa932b58e2ef571a93c04291300e58a1ab1ec2
Author: Quan Nguyen <qnnguyen@chromium.org>
Date: Tue Nov 13 22:33:57 2018

cros: Ensure login bubbles are clickable when overlapping with shelf and virtual keyboard

Bug:  884668 
Change-Id: I16dd2c5b0156bf1490b57acd4185c1d80d193a67
Reviewed-on: https://chromium-review.googlesource.com/c/1330206
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607771}
[modify] https://crrev.com/29fa932b58e2ef571a93c04291300e58a1ab1ec2/ash/login/ui/login_base_bubble_view.cc
[modify] https://crrev.com/29fa932b58e2ef571a93c04291300e58a1ab1ec2/ash/login/ui/login_base_bubble_view.h
[modify] https://crrev.com/29fa932b58e2ef571a93c04291300e58a1ab1ec2/ash/login/ui/login_bubble.cc

This bug requires manual review: M71 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Merge Approved for ChromeOS M71

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4e1b775a3fd52c834f5bfaa29570c84119225ad9

commit 4e1b775a3fd52c834f5bfaa29570c84119225ad9
Author: Quan Nguyen <qnnguyen@chromium.org>
Date: Tue Nov 27 17:26:05 2018

cros: Ensure login bubbles are clickable when overlapping with shelf and virtual keyboard

Bug:  884668 
Change-Id: I16dd2c5b0156bf1490b57acd4185c1d80d193a67
Reviewed-on: https://chromium-review.googlesource.com/c/1330206
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#607771}(cherry picked from commit 29fa932b58e2ef571a93c04291300e58a1ab1ec2)
Reviewed-on: https://chromium-review.googlesource.com/c/1352054
Reviewed-by: Quan Nguyen <qnnguyen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#823}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/4e1b775a3fd52c834f5bfaa29570c84119225ad9/ash/login/ui/login_base_bubble_view.cc
[modify] https://crrev.com/4e1b775a3fd52c834f5bfaa29570c84119225ad9/ash/login/ui/login_base_bubble_view.h
[modify] https://crrev.com/4e1b775a3fd52c834f5bfaa29570c84119225ad9/ash/login/ui/login_bubble.cc

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/4e1b775a3fd52c834f5bfaa29570c84119225ad9

Commit: 4e1b775a3fd52c834f5bfaa29570c84119225ad9
Author: qnnguyen@chromium.org
Commiter: qnnguyen@chromium.org
Date: 2018-11-27 17:26:05 +0000 UTC

cros: Ensure login bubbles are clickable when overlapping with shelf and virtual keyboard

Bug:  884668 
Change-Id: I16dd2c5b0156bf1490b57acd4185c1d80d193a67
Reviewed-on: https://chromium-review.googlesource.com/c/1330206
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#607771}(cherry picked from commit 29fa932b58e2ef571a93c04291300e58a1ab1ec2)
Reviewed-on: https://chromium-review.googlesource.com/c/1352054
Reviewed-by: Quan Nguyen <qnnguyen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#823}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}