canOpenURL: failed for URL: "instagram://app" - error: "This app is not allowed to query for scheme instagram"

Right click on your plist file and open it as source code. Then copy and paste below code:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>instagram</string>
</array>

Note: One thing you have to keep in mind that it will not work on simulator. You need a real device for this.

Open your plist as source code and paste following code:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>instagram</string>
</array>

The issue is that you are not registering the URL scheme in the info.plist file.

Please add this LSApplicationQueriesSchemes and add instagram in your info.plist and it will work. enter image description here

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