Bonusly has multiple hashtag modes. As an admin, you can set your Hashtag Mode from the basic settings page.
There are three Hashtag Modes:
Optional: Setting your hashtag mode at 'Optional' will allow your team to give bonuses with or without a hashtag attached.
At Least One Hashtag: Setting your hashtag mode at 'At Least One Hashtag' will require your team to attach a hashtag to the bonuses they give.
At Least One Company Hashtag: Setting your hashtag mode at 'At Least One Company Hashtag' will require your team to attach at least one of your company hashtags to every bonus they give. Your team may still add any additional hashtags they choose.