This is more of a FYI /fix /workaround than a troubleshooting issues/question.
Recently, the api.linqconnect.com API endpoint has started blocking certain User Agents, including axios (and curl).
Using a custom User Agent to impersonate an actual web browser bypasses this block.
I created a pull request for this:
https://github.com/evanhsu/MMM-TitanSchoolMealMenu/pull/23/changes/d35c1bd93c5953215d9cad162085cf430eed6b4c
