As of Thursday, Sep 30 14:01:15 2021 GMT, some older devices will not trust many websites in web browsers due to the following
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/.
We're updating our user-facing SSL encryption to use an edge certificate to improve our security posture and help us support as many devices as possible.
We believe that this also mitigates the above issue; however, don't hesitate to contact our support team in the unlikely scenario that you begin to see browser warnings on 30/09/21 when using any of our services.