Hey Ciaran - for Outreach, we are getting the following on the backend ""id"::"expiredaccesstoken","title"::"Expired Access Token","detail":"Please get a new access token and try again."" which indicates that you need to refresh your token with them for it to work as exepcted.
For Salesforce, have you double-checked that these records do exist within Salesforce? Specifically, do the Salesforce IDs fully match in terms of formatting?