I am trying to cast a new thread with a poll attached to it, but I cannot.
Obviously into the section "New Proposal Discussions" , posting a polll should not be prohibited.
Casting a poll is allowed in the section "General Discussion".When you create a new thread you automatically land in a Discussion style thread, which means you need to switch it over to Poll before actually posting that thread. Once posted to the forum, it will stay in the type of thread you selected (Discussion per default or Poll).
Once you select Poll, you need to scroll down to find the Poll options.
Discussion style thread (default)
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Poll style thread
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Maybe some specific sub forum parts do not allow a Poll style thread, but both in the General Discussion section and in the Economics->Speculation section it is available for users.