Quoting this post again as you said the signature bounty is still working, so because I have applied before, I prefer not to spam the thread with different authentication posts for joining signature campaign. Hope to get accepted into this. I will add the signature after my current agreement ends on Thursday.
What I understand from the signature campaign rules seems that you will be able to start joining this campaign at the beginning of the month, because there are rules said:
You must post at least 20 different days within each month.