@supportadtribes
I sent the print to the meta team, informing them that it has the tag, and they replied the following:
Hello Eduardo,
I forwarded your XML to our technical team, and they checked its content.
After investigation, the specialized team confirmed that the error in the file remains, as there is no <?xml tag added to the file.
To be valid, the file must begin with a valid <?xml declaration tag. In other words, you need to add the <?xml tag inside the file, at the beginning of the code.
For more information about requirements and supported file types, you may find the following Help Center article helpful:
Data feed fields and specifications for catalogs in Commerce Manager – https://www.facebook.com/business/help/120325381656392?id=725943027795860
Supported feeds: https://developers.facebook.com/docs/marketing-api/catalog/reference/#da-commerce
Both articles explain where the declaration tag should be added within the xml.
Therefore, this will be a correction that you must make on your part. For more specific code and programming questions, you should contact a developer, as our technical team does not support these types of questions.