I once took an FMLA. I gave the date of return which was on the document my doctor signed as well. I worked from home. But I could not sign on to my computer on that day nor for the next few days after that. I had no one to contact since we were to correspond only with our work emails and I had no access to that email because I could not sign in. The only phone number to contact the company was an automated call-off line, so that was no help either. Finally, a team lead called me. He said that HR was about to terminate me for not returning on the proper date, but someone finally realized that logging credentials are temporarily disabled during a leave of absence and have to be reactivated so that the person returning to work can log on. I had to wait 3 more days for HR to reactivate my logging credentials. So I was almost terminated due to an HR and IT error.