Route 53 with gandi .co.uk domain

When you transfer a .co.uk domain to Route 53, there can sometimes be a mismatch between the nameservers listed in your Route 53 hosted zone and the nameservers registered at the domain level (the "glue records").

Since AWS uses Gandi as its registrar partner for .uk domains (including .co.uk), it's normal to see Gandi listed as the registrar in Nominet records. However, the nameservers should match those provided by your Route 53 hosted zone.

Regarding the timeframe for nameserver updates, while DNS propagation typically takes 24-48 hours, the specific issue you're experiencing might require manual intervention. The nameservers in your domain registration settings need to exactly match those provided by Route 53 for your hosted zone.

To resolve this issue:

1. Verify that the nameservers in your Route 53 hosted zone match those listed under your domain registration details in Route 53 (not just in the hosted zone).

2. If there's a mismatch, you can update the domain's nameservers through the Route 53 console by going to "Registered Domains," selecting your domain, choosing "Action" > "Edit name servers," and updating them to match your hosted zone.

If you've already confirmed the nameservers are correctly set in the Route 53 domain registration settings but they're still not updating at Nominet/Gandi after 36+ hours, you may need to contact AWS Support through the Account and Billing section. Domain registration issues can be addressed through this support channel without requiring a paid support plan.
Sources
Getting InvalidInput setting domain IPS TAG to NAMECHEAP-INC | AWS re:Post
Route 53 owned domain is not being resolved | AWS re:Post
NS records not matching domain lookup | AWS re:Post
Troubleshoot DNS resolution issues for records in Route 53 public hosted zones | AWS re:Post