I’m having the same problem.
more info please 
iOS or Android?
which version of the app do you have?
type of devices that may not be showing?
screenshot of the problem?
iOS. I got a response from support saying it was a known issue. No ETA.
There was a service disruption earlier today, but it’s supposed to be fixed now.
Service Disruption (10 Feb 2022)
As @jkp said, A screenshot would help us figure out whether yours is the same issue. 
except I was responding to another user
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Has this issue been resolved? I am having it with the same screen shots provided by you. This makes automations unusable!
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I have the issue as @MPZ. No devices are available when trying to create an automation in the iOS app. My only workaround at the moment is to use the Smart Lighting App but there are automations I want to create not related to lighting that I cannot do.
can you post a screenshot for what you are experiencing. Always good to see it. Also, report the issue to ST support