A peering connection cannot be created between 2 VPCs that have overlapping CIDRs. Please select 2 VPCs which have distinct CIDRs.

[Andreas_Asprou]

[rophilogene (Romaric Philogene)]

Hi Andreas, indeed, you can’t have 2 VPC with overlapping network range. You need to change the subnet from one VPC to make it work.