Alexa not working since this morning

I added a few new devices yesterday (which are not enabled on Alexa). Since this morning, Alexa stopped working. I unlinked and tried to relink.. The relink also fails with Unable to link account with Alexa.

Is there any known downtime issues? Or are there any maximum number of devices limits that I may have triggered?

Rebooting the hub TWO times fixed the issue.. Not sure what the problem was or how this fixed it, or why it took two times..

Using the app or Apple HomeKit worked just fine before the reboots. Only the Alexa integration was broken for some reason.