Your ROOT_URL in app.ini is https://git.cloudchain.link/ but you are visiting https://dash.bss.nz/open-source-mirrors/overseerr/src/commit/9277a65e11824861f156138bdcf349caf18979c5/server/templates/email/test-email/subject.pug You should set ROOT_URL correctly, otherwise the web may not work correctly.
overseerr/server/templates/email/test-email/subject.pug

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!= `Test Notification [${applicationTitle}]`