Please check below image
Take a look at this KB article - https://confluence.atlassian.com/jirakb/possible-causes-for-the-error-message-couldn-t-load-refresh-in-knowledge-base-1189784993.html
It contains two possible solutions for you in the article. In addition it calls out one of the possible cause dealing with Confluence IP allowlists problem - https://jira.atlassian.com/browse/JSDCLOUD-11476
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
Viasat Inc.
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