From the console, the dedicated host state is 'pending'. This is within us-east-1b. I am unable to release the host. I can create 1 Mac host max on my account. As such, I cannot launch a mac instance. The mac instance I was able to launch previously couldn't pass status checks and I could not ssh into it. It was after fully stopping the mac instance that the host became unavailable.
To launch an instance on a Dedicated Host, select a host from within the EC2 Dedicated Hosts console. Then choose "Actions" > "Launch Instance(s) onto Host".
In the AWS EC2 Management Console, click on Instances in the left menu (1) under EC2 Dashboard. Click on the Connect button (2) to open the Connect To Your Instance window. You will copy and paste information from this window to your Mac Terminal window later.
This seemed to resolve itself over time and might be a stability issue on the AWS side. I'm going to leave this answer here because I didn't see any support on this issue elsewhere. Solidarity if you're reading this.
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