If you haven't already, it seems you need to request ETF trading permissions
And if that's not working they have articles on why it still may be rejected:
https://www.interactivebrokers.eu/lib/cstools/faq/#/content/faq%3A%2F%2FpageId%3D35791095?articleId=41555180
I don't know much about your situation, but a quick Google finds someone else asking the same question with a few possible answers:
https://money.stackexchange.com/questions/112871/buying-an-us-etf-from-europe-using-interactive-brokers
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