'AWS CloudWatch Composite Alarm Cross Account

I have a use case where I want to share my alarms with a specific monitor account within AWS organization. What I then would want to do is to create a composite alarm of all shared alarms. Is this not possible? The "create composite alarm" is greyed out even when I have full cloudwatch permissions set for the monitor account.

"You can combine metrics from different accounts using Metric Math and organize cross account alarms into hierarchies using composite alarms in the monitoring account."

https://aws.amazon.com/about-aws/whats-new/2021/08/announcing-amazon-cloudwatch-cross-account-alarms/

amazon-cloudwatch cloudwatch-alarms aws-organizations

Solution 1:^[1]

Per the AWS docs:

In the list of alarms, select the check boxes next to each of the existing alarms that you want to reference in your new composite alarm. Then choose Create composite alarm.

You need multiple alarms to create a composite alarm.

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Solution 1	BRasmussen

'AWS CloudWatch Composite Alarm Cross Account

Solution 1:[1]

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Solution 1:^[1]