Bugs dans les messages Instagram

Hello everyone! I've been having a problem with my Instagram account for a while: some people I don't follow can't send me a message. The following message appears: you cannot send a message to this account unless they are following you. However, it works for other people! Since I have a professional account and offer services, I really need to resolve this issue! If this has happened to anyone or if anyone has a solution, I would be very grateful! I've tried contacting Instagram, but it seems like they will never respond.
Thank you!