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Workflow step "losing" its assigned group

rosettakrb
Level 2
Level 2

So, we're experiencing an issue in two of our workflow models: one (or more) of the workflow steps is not able to be an active "next step" in running workflows, generating the exception "org.apache.sling.auth.core.impl.SlingAuthenticator handleLoginFailure: Unable to authenticate null: java.lang.IllegalArgumentException: Invalid authorizable name 'null'."  I open the workflow model and see a valid group assigned to the [affected] workflow step(s), but the exception seems to indicate that AEM thinks the assigned group is not set i.e. null.

Can anyone shed light on why this could be happening, what to investigate and potentially, how to resolve, please?

Thanks in advance.

RKB.

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