Follow these steps to change your Hubitat Elevation to a single linked administrator account.
If you receive a warning that your hub has multiple Admin accounts linked to it, you need to remove the additional accounts.
Press the Hubitat Elevation logo to navigate to the home screen.
Select the My Account card. This will take you to https://my.hubitat.com/
Login to your account.
Select the Registered Hubs card.
Look for the hub(s) with the warning message.
Select the Hub Details button.
Press the icon shown to remove the additional admin account.
Repeat Step 6 until you have only one Admin account for each of your hubs.