@Fedi Hachicha Thanks for the details. I apologize for the delay in my response. It looks like you have already tried several troubleshooting steps to resolve the issue with your custom model on Form Recognizer. Here are a few additional suggestions that might help:
Double-check the configuration of your custom model to make sure that it is set up correctly. This includes the training data and the labels you have assigned to the fields in your documents.
Try testing your custom model on a smaller set of documents to see if the issue persists. This can help narrow down the cause of the issue and make it easier to troubleshoot.
If you are using a custom model for the first time, it might be helpful to compare the results of your custom model with those of a pre-built model to see if there are any differences. This can give you an idea of whether the issue is with the model or with the documents you are trying to analyze.