When trying to connect your YouTube  to your page, you might be using the wrong Youtube channel link.

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You need to use your full channel link - not the shortened version. You can find your full channel link by going to YouTube Studio.

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‍To find your channel's URL:

1. Sign in to YouTube Studio.

2. From the left menu, select Customisation. Basic info.

3. Under Channel URL, you can view and copy your Channel URL.

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or, use this website:

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https://commentpicker.com/youtube-channel-id.php

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Enter any of your YouTube channel links, it will give you your full channel link.