Certificate request stuck in pending validation over a day for .games domain registered with Route 53

I recently transferred registration for my tootsuite.games domain from Dotster to AWS Route 53, with Route 53 notifying me of a successful transfer. Now I'm trying to use AWS Certificate Manager to create a certificate for it. When I made the request, ACM generated a couple of CNAME records that I copied to Route 53. However, the request has been stuck in Pending Validation for more than 24 hours. It's possible the issue is that Route 53 only recently added support for .games domains and ACM has not yet been updated. Or it could be something else. What do I need to do to get this moving?

BTW, one weird thing about the transfer is that the Dotster nameservers were pointed to CloudFlare, I selected the option to keep them after the transfer, and in fact the two CloudFlare nameservers are shown in the Route 53 domain record for the domain (and still appear to be active, as CloudFlare URL forwarding is working for the website). However, the domain's hosted zone shows a completely different set of nameservers (four awsdns nameservers) in the zone's NS record. Would it help to copy the hosted zone nameservers to the domain record (or copy the domain nameservers to the hosted zone record)?