Are you experiencing a youtube android error showing “this action isn’t allowed”? I also encounterd the same problem but i was able to solve using the process I will explain below. The way I solved it was simple and straight forward. And I believe it will also be of help to you.
This particular problem mostly happens when you update your android OS but sometimes it isn’t so. For me i had a youtube channel and i was sharing my youtube app between two account. Some how some how one of my account was blocked by youtube which made it impossible to check my videos online with my youtube. Later i got this error but here is what i did:
Go to your android settings > Apps > youtube > Storage > Clear cache and clear data.
You too can try this probably it will resolve the problem.