AWS Private CA shared with another account via AWS RAM not available for selection in the target service (ECS)

For reference, I used this guide on sharing my Private CA, which leverages AWS Resource Access Manager (RAM): https://repost.aws/knowledge-center/acm-share-pca-with-another-account

I have successfully shared the Private CA and can see it in the other account, however, when I go to the service I want to use it with (ECS), I do not see it in drop down for Service Connect. It shows up perfectly fine in the primary account that it is being shared from. Both accounts are part of the same organization. Both accounts have an IAM role with the required IAM policies attached.

I have opened a case with AWS, however, they are still reviewing but the support agent did confirm they are able to replicate the issue. Has anyone else experienced this and found a workaround?

Here is the ECS UI where I expect to see it:

Here is the Private CA dashboard where I can see that it's shared from the primary account: