Can't enable Alexa's "Home Assistant" skill

Hi!
I am trying to enable the “Home Assistant” skill the Alexa app on my phone. After scanning the barcode with my phone, I get the link to the Alexa app, with the “Home Assistant” skill selected. I press the “ENABLE TO USE” button, then I get the message “We were unable to link the skill at this time. Please try again later.”:

I am logged into Nabu Casa:

Any suggestions welcome.