Blocking and Unblocking on YouTube
YouTube lets you block other accounts, which stops them from commenting on your videos, messaging you, or appearing in search results tied to your account. It sounds straightforward, but the unblock side of things is not as clean as most people assume. I ran into a problem recently where I had blocked a creator two years ago and then tried to unblock them so I could actually watch their content. Even after clicking unblock in my settings, their videos still didn't show up in my feed or search results for nearly a week. I had to clear my browser cache and sign out and back in before everything returned to normal. The block list in your settings reflects the current state, but the recommendation engine and search indices on YouTube's side lag behind sometimes.
Can You Unblock Someone On YouTube
Yes, you absolutely can. Here is how it actually works in practice. Go to your own channel, click on your profile picture, scroll down to Settings, then navigate to Privacy. Under the "Blocked Accounts" section you will see a list of every channel you have blocked. Next to each name there is a small button that says "Unblock." Click it and confirm. That is it. The person will not get any notification that you unblocked them, and they won't know anything changed on your end. You can also do it directly from a blocked channel page. Search for the channel, go to it, and look at the three-dot menu button. If you've previously blocked them, you'll see an option to unblock. Same result either way.
There are a few things that don't happen when you unblock someone. Their previous comments on your videos stay deleted. They don't automatically get followership or a channel subscription. Any live chat history you had with them is not restored. The block just stops functioning going forward. One counter-intuitive thing most people miss: blocking someone doesn't completely remove their content from your experience. If you block a channel but still subscribe to another channel that features them, or if they comment on a video you actually watch, their content can still appear in your feed. Blocking is more of a filter on direct interaction than a full content purge. If your goal is to never see their stuff again, you need to be more aggressive with your subscription management. Another practical detail: if the person you blocked has created alternate channels under different names, unblocking the original account won't stop the new one from contacting you. I learned this the hard way when I unblocked a channel, only to have them message me from a brand new account about ten minutes later. There is no bulk block feature on YouTube as of right now, so you have to deal with each one individually.
Get the Full Details

The unblock process takes effect almost instantly on YouTube's end, but cached recommendations and search results might stick around for up to 48 hours before fully clearing. If you need it cleared faster, signing out and back in, or using an incognito window to check, is the quickest workaround.