Completion Deadline option on Adobe Sign small business plan

I wondered if anyone could confirm whether the ability to have a completion deadline (ie document can only be signed within a certain number of days) with a small business plan.

The docs on adobe site show that it is available, online chat with adobe support said it was available but in my small business trial it is not an available option. I have tried with both the word plugin and through my adobe sign account.

Anyone know the answer to this?

thanks Mark