Catch-All Email not working

Yes. They are all working GSuite emails. Obviously they are not working now, since I enabled the Cloudflare MX records, instead of Google ones. When I send an email to the catch-all address, I get this undeliverable error:

Diagnostic-Code: smtp; 5.1.0 - Unknown address error 521-‘5.3.0 Upstream error. zSm8UEuWnOxy’ (delivery attempts: 0)

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