Cannot open document because Office keeps trying to sign in to Office 365 with the wrong account

Question

Problem: I cannot open Office documents from SharePoint on Office 365 because Office tries to sign in with my Microsoft account instead of my Office 365-account.
History
When we started the project, I did not have an Office 365-account yet for the organization I was working for. To get temporary access to SharePoint a colleague invited me on my Microsoft Account to gain access to SharePoint. This worked fine and I
was able to access SharePoint. A few days later I received my official Office 365 account, so I also got e-mail etc. Because I now have an official Office 365 account, we removed my Microsoft Account from SharePoint. So now I only have access to SharePoint
with my Office 365 account.
The problem is that I can no longer open documents in Office. In the web version everything works fine, but if I want to open a document in for example Word, it says the document cannot be opened. Sometimes it shows a screen which says "Something
went wrong". If I click through to go back to the website, it show me that it tried to login with my Microsoft Account and that this account does not have access to the site. It suggests to sign out and login with a different account, but this leads to
a page that does not exist. I cannot figure out how to make Word use my Office 365 account.
What I have already tried
-Remove all my browser history and temporary files
-Add Office 365 as a connected service in Office. I can sign-in with my Office 365 account and the location is added, but I still cannot open documents.
-Tried a different pc. But because Office syncs al my settings, I got the same problem on all my pc’s.
-Removed all my Windows credentials via the credential manager in the control panel. If I also remove the credentials for my Microsoft Account, Office cannot sign in anymore. At this point, if I try to access SharePoint, it asks me for my credentials
and I have access to the documents. However, if I restore my Microsoft Account in Office again by entering my password, the problem is back.
-As a work around I can add my Office 365 account as a separate Office account. I have access then, but it is really annoying because every time I want to open a document, I have to open Word, switch accounts, close Word and open the document. It is
not capable of automatically selecting the account to use.
Conclusion and question
I have also worked with other Office 365 organizations which I can easily add to the connected services in Office and they work fine. So somehow Office has linked my Microsoft Account to this organization of Office 365 and it refuses to use the correct
account. Does anybody know how to unlink my Microsoft Account from this Office 365 organization so that I can use the correct account?

Answer 1

Try these steps from the source linked below:
Stop connecting to a connected account
You can stop connecting to a connected email account in Outlook Web App by removing the connection.
In Outlook Web App, click Settings >
Options > Account > Connected accounts.
Under Account Name, select the account you want to stop connecting to.
Click Delete to remove the connection.
Click Yes in the dialog box to confirm that you want to stop connecting to the account.
http://office.microsoft.com/en-us/support/connected-accounts-HA102836325.aspx