A Google product feed is generated blank. What can I do?

If you can't submit your feed because its empty, first, please, use this guide to ensure that it is set correctly.
If the problem remains, please, try removing the string with the <g:rate> attribute from the feed template as below:

Alt: Remove the <g:rate> attribute.

Now click Update, Save, and Generate.

→ Manage your tags and track customer behavior efficiently with Google Tag Manager for Magento 2.

See more details on Product Feed page

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