This article describes how to use tenant selection. 

• Visit https://gateway.quill-interactive.co.uk
• Input your username and password

Your username should follow the format of firstname.surname@ad.quill-interactive.co.uk.

• Once signed in, click on the authorisation icon, this will download a file name cpub-TenantSelect-Tenant_1-CmsRdsh.rdp.
• To get to your downloads, please press the Windows key on your keyboard and R, then search Downloads.

• This will open your downloads folder, double click on the file, cpub-TenantSelect-Tenant_1-CmsRdsh.rdp.
• Sign in with the login details
• Once signed in,  click on the icon shown in the screenshot below

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You will be prompted to sign in with your Unity Practice Management login details. After you have signed in, double-click on your company's name. 

This will re-attach you to the database.

Close both this application and Unity Practice Management Accounts and re-open.