Xero - Unable to select company due to multiple companies already existing

Barclays does not support uploads for multiple companies at one time. Each company must be uploaded by itself.  If a client has numerous companies, Xero greys out the already-connected companies and does not allow you to select a company because it is already connected.

An error message will appear "You have not selected any company or have selected multiple companies. Please select one."

To disconnect existing companies first start a Xero upload. 

Select Xero as the accounting package then click Continue.

Click on the Connected Apps link below to be redirected to Xero.

• Click the organization name, then select Settings.
• Click Connected Apps.
• Under the Connected Apps heading click Disconnect beside the app name.

Update, cancel, disconnect or review connected apps – Xero Central