Thanks (and for others too for the exact IP address) for sharing this workaround.
I have an Asus AC66U_B1 router with Merlin firmware and although don’t have pihole or adguard home server I was able to add to host file described in this post.
added the following line to hosts.add file:
52.215.226.151 production.receiver.melcloud.com
Now my AP35 AC unit is controllable and working again from HA!