Does the BambooHR account need any special account permissions?
Some actions require a certain level of permissions to use them. For example, the "Respond to Time Off Request" action can only be used by users who are able to approve time off requests. Here are some helpful articles from BambooHR that describe how to configure permissions:
Creating Custom Access Levels: https://help.bamboohr.com/hc/en-us/articles/222006947
Managing Access Levels: https://help.bamboohr.com/hc/en-us/articles/216834217
Creating non-employee users: https://help.bamboohr.com/hc/en-us/articles/115009157147-Hints-Tips-Create-Non-Employee-Users