Join field in modelbuilder wont work, but will manually

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I'm trying to do a 'join field' in a model. When I do the join simply not in a model, no problem.
When I try to use the 'join field tool' in a model, I get the "" does not have OIDs.

I have a very simple feature class in a gdb, trying to join with an Excel sheet.No problem to join. Only in the model.

Anyone got a clue?Both files comply with the 'join rules' in filenames etc.



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