Yes, DDoS Protection is supported for Cloud Services (extended support).
I have requested some more information from you in the private message to further understand your scenario.
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If we migrate our existing Cloud Service (Classic) instances over to Cloud Service (Extended) will we be able to use DDoS Standard? I'm asking because as a group we are trying to decide if it is worth the trouble to do manual migrations to extended support now or wait until the Classic to Extended migration tool is released and no longer in preview.
Yes, DDoS Protection is supported for Cloud Services (extended support).
I have requested some more information from you in the private message to further understand your scenario.