Good day!
Can't connect to you via API. There might be a problem with your SSL certificate. It is strange that no one else has written about this on the forum. On September 30th, old devices with Let's Encrypt certificates expired.
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
Update September 30, 2021 As planned, the DST Root CA X3 cross-sign has expired, and we’re now using our own ISRG Root X1 for trust on almost all devices. For more details about the plan, keep reading! We have also updated our Production Chain Changes thread on our community forum - our team and community are here and ready to help with any questions you may have about this expiration.
On September 30 2021, there will be a small change in how older browsers and devices trust Let’s Encrypt certificates. If you run a typical website, you won’t notice a difference - the vast majority of your visitors will still accept your Let’s Encrypt certificate. If you provide an API or have to support IoT devices, you might have to pay a little more attention to the change.
Let’s Encrypt’s root certificate has expired, and it might break your devices
https://techcrunch.com/2021/09/21/lets-encrypt-root-expiry/
