Solved by merve in post #3 
              
              
                Hello  
You need to set from_pt = True when loading. 
from transformers import TFAutoModelForSeq2SeqLM

model_checkpoint = "Helsinki-NLP/opus-mt-en-fr"

model = TFAutoModelForSeq2SeqLM.from_pretrained(model_checkpoint, from_pt = True)

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