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If they can demonstrate a valid business need for your services at the other site, then they could insist you move to that location. However, if you believe this is being done in retaliation
for you using FMLA, then you need to file a complaint through your employer's grievance process and you can also file a complaint to the US Department of Labor
if your employer will not reverse your management team's decision.
Under FMLA you are entitled to reasonable accommodation, so in order for the employer to move you they would have to prove a bona fide need for you to be at the other location and then they could insist you move to the other location.
So you have to go through the process internally first and if your upper management still denies your FMLA accommodation, your next step would be to go to the US Department of Labor, which handles FMLA retaliation and other FMLA violation complaints.
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