I just want to find out if I can use a discussion page to get suggested topic for a bot?
Thank you in advance
Does your discussion page require logging in? If so, I would say you can't use it.
These are the pre-requisites for using content in the suggested topics:
If it still doesn't work even though the site is with https and you can access the discussion pages without a username and password (anonymously) I would suggest to contact Microsoft Support Team to investigate the issue, https://powervirtualagents.microsoft.com/en-us/support
Btw, you have tried other anonymous https online sources, do those work?