That suggests that the field "account" has been removed from the screens, while your workflow contains validators and/or field configuration say that the field is mandatory.
The "account" field is often a function of the Tempo add-on - do you have that in your menu? Could you check if it's installed and enabled?
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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