If you have an e-residency card, read this statement by the e-residency program, which contains the following practical info: all existing e-residents will need to update their certificates (once ready) using the ID card software on their computer. It will be possible to easily update the certificates remotely (without travelling to an Embassy) and you will be automatically notified by the Estonian Police and Border Guard Board when the update is ready — although we will also remind you through all our official e-Residency channels.

Ars Technica has the original article explaining more about what went wrong.