I will be posting discussion topics to get your expert advice to help new or first-time Jira Software Admins be successful.
Usually network related things lead to issues with Applications links.
Always make sure your Atlassian Applications can "see" each other on a network and server level. ;)
Also if working with reverse proxy, do it according to Atlassian Documentation.
I can refer you all to Reverse Proxy and Application Link Troubleshooting Guide
