Public Key Upload Failed - Error while communicating with eM Keybook server

Settings - Signing and Encryption - Certificates and Keys - (Right Click) Upload to - Select “Upload to eM Keybook”

Fails with “Public Key Upload Failed - Error while communicating with eM Keybook server. Please try again later.”
Screenshot 2024-02-05 105819

I have a laptop and a desktop both running Windows 11 PRO. eM Client version 9.2.2157. I have tried to upload my new PGP public key from my laptop and desktop several times and on different days. But I receive the error message.

I have successfully uploaded public PGP keys in the past.

Please help fix this issue.

Thanks.