RSS OJS Tidsskrift.dk

** RSS is not valid *

Steps I took leading up to the issue:
Tried in email - failed.
Validated failed [beta] Feed Validator Results: https://www.nys.dk/gateway/plugin/WebFeedGatewayPlugin/rss2,
User tried with Zotero - failed.

What I tried to resolve the issue:

Application Version - e.g., OJS

Additional information, such as screenshots and error log messages if applicable: