If I'm understanding correctly you had separate Hulu and Disney+ subscriptions, but want the bundle, so you cancelled both? And also want to add HBO Max?

The yeah, once the previous Disney+ account fully cancels(it will exist till the end of the billing period) you can sign up for the bundle inside Hulu and have it also have no ads. Then you can also add HBO Max to it.

Note to watch a lot of HBO Max content you need to use the separate app, you can only watch regular HBO content inside Hulu.

I don't think you can link your account. I think you'd need to cancel your individual HBO max account, and sign up for it through HULU.

However, I don't know what the point of that would be. you can get HBO max alone for half the price as it is through Hulu. and even with Hulu + HBO Max, you still need to use the HBO Max app. you would just log into HBO max with your credentials.

(At least that's my understanding. I haven't done HBO Max through Hulu, and just have it on its own)