error message app download not from app store

Mentions let you direct a message to an individual in a group conversation.Mark as unread when you don’t have time to respond but want to be sure to reply to the sender later.Unsend any message for up to 2 minutes after sending it.Recipients will be able to see a record of edits made to the message. Edit any message for up to 15 minutes after sending it.Your name and photo, or even Memoji, can be shared with your friends.Name a group iMessage and add a photo to personalize the group conversation.Use Messages in iCloud to keep your entire message history, including SMS and MMS, updated and available on your iPhone, iPad, iPod touch, Apple Watch, and Mac, even when you set up a brand-new device.Send texts, photos, videos, documents, stickers, Memoji, and more to contacts using their phone number or Apple ID.Send unlimited texts, photos, videos, documents, and more to any iOS, iPadOS, macOS, or watchOS device with iMessage, or use it to send SMS and MMS messages.

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Error message app download not from app store