AmazonEC2RoleforSSM will be deprecated soon.

[gutozntt]

File template.yaml - line 662

• !Sub arn:${AWS::Partition}:iam::aws:policy/service-role/AmazonEC2RoleforSSM

Since this policy will be deprecated soon, I recommend you guys using AmazonSSMManagedInstanceCore.

Make sure to remove the /service-role/.

• !Sub arn:${AWS::Partition}:iam::aws:policy/AmazonSSMManagedInstanceCore

[zipengw27]

Thank you @gutozntt . We have merged a PR that uses the recommend policies instead.