Update related workflow instance - Incorrect instance ID

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Hi, I need your help. The topic is actually quite simple, but unfortunately I have a problem with this one process.

I start a new parallel subworkflow in an action (ID is saved in a technical field), which I want to update later.
In the action "Update related workflow instance" we get the message for the users: Incorrect instance ID: ''.

When we execute this workflow, the ID is found and the data is written.
So it seems to be an authorization problem?
Both processes are in the same application.

Greetings