Additional verification required to request certificates for one or more domain names in this request.

My AWS SSL certificate failed to renew with the message "Additional verification required to request certificates for one or more domain names in this request.". The User Guide suggests the following: "ACM requires additional information to process this certificate request. This happens as a fraud-protection measure if your domain ranks within the Alexa top 1000 websites. To provide the required information, use the Support Center to contact AWS Support. If you don't have a support plan, post a new thread in the ACM Discussion Forum."

Needless to say, all the required for the verification DNS records are there. This certificate was first issued in 2019 and then successfully renewed itself yearly until now. Unfortunately I don't have a support contract, so posting here looks like my only hope to resolve this.

So here I am following the suggestions from the User Guide. Any ideas what to do next? Your help will be highly appreciated!