@Emil In addition to my Flic buttons, I've personally tested the issue with Shelly Buttons, my Ring Doorbell, and Virtual Buttons. You can likely read about the issue on the Getting Started comments at www.virtualbuttons.com and elsewhere.

BTW, things appear to now be working again, at least in my corner of the US.

This is an Amazon issue and it's affecting many other services such as routines triggered by Shelly Buttons, Virtual Buttons, and Amazon's own Ring Doorbells.

I've sent a message about it to Amazon. Perhaps we all should?

Here is a blog post on an easy way to get Flic buttons to trigger Alexa Routines without any custom coding: https://okko.eu/flic-button-to-alexa-routine-1560e3844457