Addon installation failed - native messaging

Add-ons
#1

I am developing a native messaging based firefox web extension. To get the signed addon, I have created a developer account and submitted the zip file. When I tried to install the addon (.xpi downloaded) on Windows 7 32 bit with firefox version 61.0, it gives below error:
This add-on could not be installed because it appears to be corrupt

Logs in browser console: add-on is not correctly signed, Invalid XPI - Signing Verification failed.

This addon gets installed (and rest functionality also works) when I installed using about:debugging options.

Again same downloaded .xpi addon gets successfully installed on mac os.

Please help with possible issue.

#2

Please create a zip file of the add-on, and attach it to your reply.
(The “Upload” icon is the arrow pointing up, 7th from the left)

#3

Does installing any other extension from addons.mozilla.org work on that machine? If not, please make sure your time is set correctly.

#4

After setting time correctly, it is working fine. Thanks a lot…!