A company is migrating to AWS and intends to use multiple VPCs across multiple AWS Regions. A network engineer needs to establish connectivity between the eu-west-1 and eu-central-1 Regions to the company headquarters and branch office, respectively.

The network engineer created a production VPC, Prod A, with a CIDR block of 10.0.0.0/16 in an account in eu-west-1, and another production VPC, Prod B, with a CIDR block of 10.1.0.0/16 in a different account in eu-central-1.

The network engineer performed the following steps to establish connectivity:

1. Created a transit gateway in each Region
2. Shared and accepted the transit gateways with the production accounts in both Regions
3. Configured a peering attachment between the transit gateways
4. Attached both VPCs to their respective Region's transit gateway
5. Created transit gateway route tables and associated the attachments with the route tables
6. Configured static routes in both transit gateway route tables to direct traffic to the remote VPC in the other Region
7. Enabled route propagation on the VPC route tables in each Region

After completing the configuration, the network engineer attempted to connect from Prod A to Prod B but was unsuccessful.

What steps should the network engineer take to ensure the required connectivity is achieved?