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Youtube sign in warning message.

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I am getting a Youtube sign in warning message. When I try to join to any channel while I am logged in, "Sign in to become a member" warning message appears. The same happens when I try to like a video or want to subscribe a channel. When I tried it on different web browsers (Chrome, Opera, Vivaldi etc) there was no sign in problem.

While I see that I am logged in at the top right, a login button appears in the menu on the left. When I press the button, a page with a warning message opens: "405. That’s an error. The request method GET is inappropriate for the URL / youtubei / v1 / guide. That’s all we know."

I deleted cookies in Firefox. I reset the Firefox browser. I deleted and reinstalled Firefox but the problem still exists. That's why I can't use the Firefox web browser. If you have any suggestions to fix this situation, I would be happy to use Firefox browser again. I hope you can help me.

I am getting a Youtube sign in warning message. When I try to join to any channel while I am logged in, "Sign in to become a member" warning message appears. The same happens when I try to like a video or want to subscribe a channel. When I tried it on different web browsers (Chrome, Opera, Vivaldi etc) there was no sign in problem. While I see that I am logged in at the top right, a login button appears in the menu on the left. When I press the button, a page with a warning message opens: "405. That’s an error. The request method GET is inappropriate for the URL / youtubei / v1 / guide. That’s all we know." I deleted cookies in Firefox. I reset the Firefox browser. I deleted and reinstalled Firefox but the problem still exists. That's why I can't use the Firefox web browser. If you have any suggestions to fix this situation, I would be happy to use Firefox browser again. I hope you can help me.
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由 user2968308 於 修改

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I too am having this problem.

Disabled all add-ons, cleared cache, logged in and out multiple times. I even tried disabling my VPN to test.

I can browse and watch videos fine, just can not subscribe or switch accounts.

I tried solutions presented in other threads and have had no luck. Any help would be appreciated.

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Remove History For One Site {web link}

Open the History Manager <Control> (Mac=<Command>) <Shift> H. In the search bar, enter the name of the site. Right-click on one of the listings and select Forget About This Site. This should remove all information, including any site settings

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This does not solve the issue.