I can't link my Apple ID to my existing Dropbox account.

Hi Reimu, and thanks for your post. 

When saying you want to link your Dropbox account to your Apple ID, are you referring to the “Sign in with Apple” option? 

If yes, you’ll need to make sure your Dropbox email address matches the one linked to your Apple ID (you can update it on Dropbox with these steps) and then click on the “Sign in with Apple” option next time you sign in.

Let me know if that helps.

Yes, I mean "Sign in with Apple". I have done what you said, changed my email to my iCloud (using Hide my Email), but when I sign in with Apple, it shows Sign-in failed: 401 Unauthorized - This account is disabled.

I have deleted my Dropbox account created by my Apple id and seems cannot re-create a Dropbox account using this Apple id?

I'm confusing, it seems that I can sign in my Dropbox account with both of my non-Apple email and my Apple id if my Dropbox account is signed up with Apple id. But if my Dropbox is signed up with email, it can only link Apple id with the same email address?

Hey Reimu - sorry to jump in here, but could you clarify what exactly you'd like to accomplish here?

Are you getting this error when trying to sign into your account or when trying to create a new account using the email address you had used in the past? 

Could you maybe send us a screenshot so that we can make sure we're on the same page? 

I have a Dropbox account created using "Sign in with Apple" (with Hide my Email option) and I deleted it. Then I created a new Dropbox account using email.

I want to be able to login to my new Dropbox account so I changed my email address matched to the address of "Sign in with Apple" (with Hide my Email option) .

But I cannot login in with Apple, which show: "Sign-in failed 401 Unauthorized - This account is disabled"

Hey Reimu, can I send you an email in order for us to have a closer look into this? 

Sure.

I just sent you an email Reimu! 

I'll see you there!