Domain name MX records not full propagating after registrar switch

The domain in question is otbefun.com.au.
My registrar now is CheaperDomains, because Cloudflare doesn’t support the tld that I’m using.
I believe the issue is related to the A, AAAA, CNAME record not being correctly configured.
My nameservers are pointing to Cloudflare, but after the transfer, ImprovMX (who I used for email) can no longer “find” my domain…
I’ve been in touch with ImprovMX, and they’re suggesting there is an issue with propagation, because when my domain is run through this tool: https://dnschecker.org/#MX/otbefun.com.au, we can see that some servers have the records, but others don’t, and it’s been well over a 48 hours that the records have been set in Cloudflare.

My first question is, do I need an A, AAAA or CNAME record at all for the MX record to work? If I do, what value should I use? I don’t currently have a website for that domain, it’s just being used for email.
I currently do have a value for an A record, but it’s using an IP that I’ve just copied from another domain in my cloudflare account that email is working fine for…

I’m at a loss for what debug steps to take next

You have invalid DNSSEC settings at your registrar which need to be removed. These are preventing DNSSEC validating resolvers from resolving the domain as the records are not signed correctly.

https://dnsviz.net/d/otbefun.com.au/dnssec/

Thanks so much for the reply!

Checking with my new registrar, it appears they need to add DS records, so I’ve created a support ticket for them to do that.

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