That fixes it! Thanks. In all my debugging I assumed that " can't convert Array into String " referred to the hiera variables. And it was about the role variable all along. You were right, I had a top scope variable role defined in a custom fact, which was also in the hiera hierarchy, and another role passed as a parameter to the module. Now I wonder why without hiera they can both live together. Probably the hiera call that resides inside the module gets the local scope for hierarchy and not the global one, so it creates each hierarchical string with an array passed from the parameter. Anyway, thanks for your prompt answer.
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