When their profile appears in search results, tap on it. If they are blocked, you might see limited information or a note indicating the block.
Tap the (People) on the bottom menu of the Xbox App. how to unblock someone on xbox app on iphone
The player will immediately be removed from your block list. They can now send you messages, party invites, and see your online status. If you blocked someone recently and still have the message thread in your Xbox App’s chat history, this method is much faster. When their profile appears in search results, tap on it