Error while access customer information backend 500 error,
Exception #0 (Magento\Framework\Exception\LocalizedException): The "formElement" configuration parameter is required for the "saved_tokens_json" field.
Log error :
[2020-08-08 14:36:40] main.ERROR: The "formElement" configuration parameter is required for the "saved_tokens_json" field. [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'catalog.compare.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'sale.reorder.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'wishlist_sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'authorization-link-login' tries to reorder itself towards 'register-link', but their parents are different: 'header.links' and 'top.links' respectively. [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'footer.custom.block' tries to reorder itself towards 'copyright', but their parents are different: 'footer.content.bottom' and 'footer' respectively. [] [] [2020-08-08 14:36:41] main.INFO: Broken reference: the 'store_language' tries to reorder itself towards 'store_switcher', but their parents are different: 'header.panel.right' and 'header.panel.store' respectively. [] [] [2020-08-08 14:37:04] main.INFO: Consumer "async.operations.all" skipped as required connection "amqp" is not configured. Unknown connection name amqp [] []
Seems like this issue you're facing after migration, so either some attribute values are missing or some products are missing of that attribute, you can try with the solutions given in below answer :
Let us know here if these don't help.