The issue hasn't been fixed - not only I am not able to update my Chanel and receive the same error - I am still in the creation phase, and I am not able to pass the Feed screen. After entering the feed link I am clicking on continue and nothing is happening, I see the loading icon and the page doesn't move. and when I am forced to log out after waiting for hours, I login and when I can click on edit the channel so I can continue I get the error message that the Chanel data couldn't be retrieved. So I don't know what your engineers fixed, because the error for me still there since yesterday. I have tried using Safari, Chrome, Firefox and nothing works.
I get the same thing when I try to create a new channel. I can however access my channel page now, so I'd say they fixed that issue.
I need the channel creation issue resolved tho.
