At the moment, .gr domain is not supported by Amazon Route 53 but they continue to add support for more TLDs based on customer feedback.
Can I use any other option to transfer the domain on the AWS?
Guide for transferring a DNSSEC enabled domain to Route 53Accepted Answerasked a month ago
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Unable to transfer IDN ".online" domain to AWS Route 53Accepted Answerasked 3 years ago