We've updated the way we make the calls so now this new root certificate is now not causing the requests to fail anymore.
We have reviewed all the others apps and they are working correctly.
Customer's apps were not affected at all by this problem.
Sorry for the trouble.
Update (01:24 PM EDT): Some users of your app could experience issues with certificate errors but this is not directly related to our problem in Galaxy UI.
Old browsers are not going to be compatible with the newest Let's Encrypt Root Certificate (https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
) and Galaxy uses Let's Encrypt to generate certificates automatically.
If you really need to support old browsers you need to use a different certificate than Let's Encrypt and upload your custom certificate in your app settings on Galaxy
Update (5:31 PM EDT): Issues related to Expired Certificates are explained here https://docs.meteor.com/expired-certificate.html
(They don't have a direct relationship with this problem in specific but maybe a few people will check this page anyway).