Managers told me that travel reimbursement / mileage is "no longer allowed" for pharmacy. Is this true?

I am a pharmacy associate lately I have been asked for help by other stores which I gladly take due to the lack of hours at my home store. My manager and DM told me " we no longer do travel reimbursement due to a recent change to that program". And that I cannot submit it anymore, the system is still active on passport. I couldn't find anything in the handbook or in the emails on this new policy.

I haven't been able to get a clear answer from anyone. I'm kinda scared to even post this. I am driving a lot of extra miles on my own dime. Has corporate actually changed the travel policy for the pharmacy department, or is my managers trying to save their own budget? What should my next step be?