PowerBI dataset refresh error

We just started having this issue overnight also for about 5 datasets but about 15 others worked fine.   I just manually refreshed one that was successful overnight and it still runs but the 5 that errored are all now erroring immediately. No changes to any reports/datasets have been made in at least a week. I know we do need to upgrade our gateway eventually but that's going to be a process b/c the original person who installed it is no longer with the company and didn't record their recovery key.  It just doesn't seem to make sense that some datasets work (and direct queries) and some dataset refreshes do not.  I can refresh using Power BI desktop also without any issues.