Our server doesn't itself refer to any public blacklists. I'd guess it's CloudFlare that implement the block.
I have to emphasise, in general we can't help with these types of questions, as it's out of scope for what we can help with. If I knew of any conceivable reason our build service would be blocking anyone I'd have mentioned that first.
I tried different ips using VPN Nord...i cant build my IOS game anymore since last Thursday, are you sure there is no issue on that?