Hi @lalder - thanks for posting. Can you tell me what tool you're using to import your Excel spreadsheet? If you can give me a screen shot and describe the menu path you're using it will help.
Can you try chunking/staggering - Try 5k records.
If that works, you most likely its not an issue with the type/shape of source data and try going up do 10k chunks and then 20k.
500k at one-shot could be the issue unless there are other issues with source data.
BTW, you should see errors under 'notifications' (left hand pane). You want to report those as well.
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