Possibility of using email routing while email hosted elsewhere?

Hi folks, i had domain and email hosted at porkbun, and moved the DNS to CF.
As for the email hosting, porkbun had a guide (basically we just need to move our MX and TXT records to CF) and now everything is working well.

But now i want to use CF's email routing feature and for that I would need to add a new email, but when enabling it, I see a conflict message. Does it mean I can't use email routing in CF with email hosting purchased outside CF?
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