In the old days (a few years ago,) YouTube accounts were different from Google accounts. That was true even after Google acquired YouTube with 1.65 billion in stock. A YouTube user used a set of user name and password to log in, where the same user used a separate set of user name and password to log in a Google account.
Later on, Google managed to link Google accounts and YouTube accounts. A Google user could just log in once, then the linked YouTube account would log in with one single set of user name and password. It worked pretty much like today’s social network accounts.
Nowadays, Google makes it official to use only one Google account for both Google and YouTube services. Here is how to link a YouTube account to a Google account.
If a YouTube user wants to re-link his/her YouTube account to a different Google account for some reason, it can be done by following the instructions here.
There is an exception that this link might NOT work.
If a gmail account is linked to a YouTube account, the link is unbreakable. It will show a “!” in red and
Your account is permanently linked to a Google Account
That means this Google account and YouTube account are paired up permanently. The link should never be changed.
Is there any way to get around the Google-YouTube permanent link problem?
Yes! But it’s risky.
Here is the trick: Delete either a Google account or a YouTube account. This will force to break the Google-YouTube tie.
But the risky side is that Google does NOT release the previously used user IDs for re-use. This is true for YouTube user IDs too. In this case, user has to give up at least one user ID to re-link a YouTube account to a Google account.