Fix Facebook Page "Send Message" Button Missing / Not Showing Issue via AnyDesk

!!!!!!!!! Don`t sent outo or ai msg pls I need an experienced Meta / Facebook Page Specialist to fix an issue on my business page: SM LINEN (https://www.facebook.com/smlinenth). Currently, visitors cannot see the "Send Message" (Messenger) button on my page header... (Budget: $10 - $11 USD, Jobs: Facebook API, Facebook Development, Facebook Marketing, HTML, PHP, Social Media Management, Technical Support, Website Design)