Sidebar menu not loading in Jira
Platform Notice: Cloud Only - This article only applies to Atlassian apps on the cloud platform.
Summary
Problem
Jira sidebar menu is not rendering.
Diagnosis
Environment
This is related to the client's network blocking resources from Jira, to be received by the browser leading it to not being able to render the sidebar. The way this is blocked, under the client's network, changes from case to case (sometimes proxies, firewalls, or even GPOs ...).
Diagnostic Steps
In Chrome, open the development Panel (Instructions Here).
Go to the "Console tab" under the panel.
Check for errors in red. You should be seeing errors similar to the ones below:

Special attention to net::ERR_INSECURE_RESPONSE appearance.

Mentioning Blocked by CORS Policy.
Cause
Assets in the Network Environment blocking Atlassian resources from being loaded, therefore these don't reach end-users browsers and the sidebar does not load.
Solution
Resolution
Check every possible blocking asset (firewalls, proxies, ad blocks...) configuration under your network and application domains and IPs whitelisting provided at Atlassian Cloud IP ranges and domains. If the problem persists, contact support.
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