Since the 30th of September 2021, a security standard certificate expired.
This impacted all "old" devices :

To fix this issue, you need to add the 2 new Root CAs to your device and the Intermediate Certificate.

Root CA Certificates and Intermediate Certificate are attached to this article.

If your device cannot read PEM format, please download the files with DER format.

Once downloaded, you should get a pop up window which asks you to rename the files, just use the original names.

You also may need to enter the PIN of your device.

The certificate is installed.

On some devices, you may do the install manually.

Go to Settings > Security > install from from device storage > Download folder > Select the file > Done