Hello:
we have tried using ecs plugin for spinngup linux fargate container using docker image jenkinsci/jnlp-slave and working fine.

Now we are trying to spinup windows fargate and we are using same docker image jenkins-jnlp-slave-windows
we have observed ECS is trying to provision a new fargate slave
and waiting for few seconds and terminating and again it is trying to start new slave and waiting for few seconds and terminating.

attaching few screenshot from ECS cluster as well.

Below is the output from my  jenkins linux server.

INFO: [ecs_windows-qw4tz]: Waiting for agent to start
Aug 12, 2019 4:39:06 AM com.cloudbees.jenkins.plugins.amazonecs.ECSLauncher launch
INFO: [ecs_windows-qw4tz]: Waiting for agent to start
Aug 12, 2019 4:39:07 AM com.cloudbees.jenkins.plugins.amazonecs.ECSLauncher launch
INFO: [ecs_windows-qw4tz]: Waiting for agent to start
Aug 12, 2019 4:39:08 AM com.cloudbees.jenkins.plugins.amazonecs.ECSLauncher launch
INFO: [ecs_windows-qw4tz]: Waiting for agent to start

Please let us know if you need further information

attaching few screenshots
thank you,
Prashanth k.