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It depends on your contract and your country's labor laws, not really on seniority. If remote work is written into your contract or your company agreed to it through a collective agreement, they can't just ban it overnight, even after 3 years. In France for example, once it's established, it's harder to take away without negotiation. But if it was just an informal arrangement, they have more flexibility. Check your contract and your company's agreements, or contact the labor court if something seems off to you.
The thing is, you don't have any "acquired right" to remote work just because you've been doing it for 3 years. What really matters is whether it was a contractual obligation, a written agreement, or just your employer tolerating it. If it was just a practice without anything formal in your contract or a collective agreement, they can theoretically stop it overnight (even if that's kind of a dick move). That said, it depends on your labor law depending on the country - some places offer more protections than others once a practice becomes established. My advice: check exactly what your contract says and ask yourself whether remote work was made official anywhere beyond the "yeah, just do it from home" stage.
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